SECTION 9V
BODY CONTROL MODULE
Caution : Disconnect the negative battery cable before removing or installing any electrical unit or when a tool or equipment could easily come in contact with exposed electrical terminals. Disconnecting this cable will help prevent personal injury and damage to the vehicle. The ignition must also be in LOCK unless otherwise noted.
SCHEMATIC AND ROUTING DIAGRAM
Body Control Module Circuit (1 of 9)
Body Control Module Circuit (2 of 9)
Body Control Module Circuit (3 of 9)
Body Control Module Circuit (4 of 9)
Body Control Module Circuit (5 of 9)
Body Control Module Circuit (6 of 9)
Body Control Module Circuit (7 of 9)
Body Control Module Circuit (8 of 9)
Body Control Module Circuit (9 of 9)
DIAGNOSIS
Diagnostic System Check - Vehicle
- Verify that none of the following preliminary inspections/tests reveal the cause of the vehicle concern before beginning diagnosis :
- Ensure that the battery is fully charged
- Ensure that the battery cables are clean and tight.
- Inspect for any open fuses
- Ensure that the grounds are clean, tight, and in the correct location.
- Inspect the easily accessible systems or the visible system components for obvious damage or conditions that could cause the concern.
- Inspect for aftermarket devices that could affect the operation of the system.
- Search for applicable service bulletins.
- Install a scan tool. Verify that the scan tool powers up.
- Ignition ON, Engine OFF, verify communication with all of the control modules on the vehicle.
Important : Open the drivers door to ensure retained accessory power mode (RAP) is inactive during this test. The engine may start during this test. Turn the engine OFF as soon as the crank power mode has been observed.
- With a scan tool, access the Body Control Module Power Mode data display list. Verify that all the parameters listed in the following table correspond to the ignition key position. The PMM Power Mode parameters table below illustrates the correct state of these parameters (circuits) with the corresponding ignition switch positions. The circuits related to the parameters are in parenthesis.
- Ignition ON, view the security indicator. The security indicator should not remain illuminated after the vehicle bulb check has completed.
- Attempt to start the engine. Verify that the engine cranks.
- Attempt to start the engine. Verify the engine starts and runs.
Important : Do not clear any DTCs unless instructed to do so by a diagnostic procedure.
Important : If any DTCs are Powertrain related DTCs, select Capture Info in order to store the DTC information with the scan tool.
PMM Power Mode Parameters
Ignition Switch Position | Current Power Mode | Ign. Off/Run/Crank (Off/Run Crank voltage circuit) | Ignition Accessory/Run (Accessory voltage circuit) | Ignition Run/Crank (Ignition 1 Voltage circuit) |
Off Key Out | Off | Key Out/ACC | Inactive | Inactive |
Off Key IN (LOCK) | Off | Key In/Off | Inactive | Inactive |
ACC | Accessory | Key In/ACC | Active | Inactive |
ON | Run | Run | Active | Active |
START | Crank Request | Crank | Inactive | Active |
Diagnostic Trouble Code (DTC) List
DTC | Description | SUB SYSTEM |
B0283 | Electric Rear Defrost Circuit | HVAC |
B0981 | Transmission Winter Mode Switch Short to Ground | POWERTRAIN |
B1000 | Electronic Control Unit (ECU) Performance Special Memory Failure | ARCHITECTURE |
B1000 | Electronic Control Unit (ECU) Performance RAM Integrity | ARCHITECTURE |
B1000 | Electronic Control Unit (ECU) Performance ROM Integrity | ARCHITECTURE |
B1000 | Electronic Control Unit (ECU) Performance EEPROM Integrity | ARCHITECTURE |
B1001 | Option Configuration Error Variant Not Programmed | ARCHITECTURE |
B1016 | VIN Not Programmed | ARCHITECTURE |
B1370 | Device Ignition 1 (ON and START) Circuit Short to Battery | ARCHITECTURE |
B1370 | Device Ignition 1 (ON and START) Circuit Short to Ground or Open | ARCHITECTURE |
B1380 | Device Ignition ACCESSORY Circuit Short to Battery | ARCHITECTURE |
B1380 | Device Ignition ACCESSORY Circuit Short to Ground or Open | ARCHITECTURE |
B1395 | Device Voltage Reference Output 1 Circuit Voltage Below Threshold | LIGHTING SYS. |
B1395 | Device Voltage Reference Output 1 Circuit Voltage Above Threshold | LIGHTING SYS. |
B1428 | Ignition Switched Power Relay 1 Circuit | ARCHITECTURE |
B1433 | Ignition Switched Power Relay 2 Circuit | ARCHITECTURE |
B1440 | Power Mode Master Input Circuits Mismatch | ARCHITECTURE |
B1441 | Device Ignition OFF, RUN, and CRANK Circuit Short to Battery | ARCHITECTURE |
B1441 | Device Ignition OFF, RUN, and CRANK Circuit Short to Ground or Open | ARCHITECTURE |
B1475 | Retained Accesory Power Circuit | ARCHITECTURE |
B1480 | Battery Rundown Protection Circuit | CHARGING SYS. |
B1517 | Battery Voltage Below Threshold | CHARGING SYS. |
B1517 | Battery Voltage Above Threshold | CHARGING SYS. |
B2530 | Front Foglamps Control Circuit | LIGHTING SYS. |
B2545 | Backup Lamps Circuit | LIGHTING SYS. |
B2575 | Headlamp Control Circuit | LIGHTING SYS. |
B257A | Headlamp Switch Input Signals Mismatch | LIGHTING SYS. |
B2580 | Headlamp High Beam Control Circuit | LIGHTING SYS. |
B2585 | Left Parklamp Control Circuit | LIGHTING SYS. |
B2625 | Display Dimming Pulse Width Modulation (PWM) Output Circuit | LIGHTING SYS. |
B2645 | Ambient Light Sensor Circuit Voltage Below Threshold | LIGHTING SYS. |
B2645 | Ambient Light Sensor Circuit Voltage Above Threshold | LIGHTING SYS. |
B2705 | Gearshift Unlock Circuit Short to Ground | POWERTRAIN |
B2745 | Traction Control Switch Circuit Short To Ground | CHASSIS |
B2750 | Horn Relay Coil Circuit | ACCESSORY |
B2924 | Content Theft System Sensor 3 (inclination, etc) Signal Circuit | ANTI - THEFT SYSTEM |
B3089 | Content Theft System Sensor 1 (shock, intrusion, etc) Signal Circuit | ANTI - THEFT SYSTEM |
B3130 | All Door Unlock Circuit | ACCESSORY |
B3135 | All Door Lock Circuit | ACCESSORY |
B3265 | Trunk/Hatch/Liftglass Release Output Circuit | ACCESSORY |
B3445 | Stoplamp Circuit | LIGHTING SYS. |
B3622 | Steering Wheel Controls Group 1 Signal Circuit Voltage Above Threshold | ARCHITECTURE |
B370C | Rain Sensor Intensity Signal Circuit | WIPER & WASHER |
B370D | Rain Sensor Mode Control Circuit | WIPER & WASHER |
B3715 | Front Wiper Relay Drive Circuit | WIPER & WAHSER |
B3794 | Cruise Control Function Request Circuit Signal Invalid | POWERTRAIN |
B3794 | Cruise Control Function Request Circuit Actuator Stuck | POWERTRAIN |
B3812 | Content Theft System Sensor Ground Circuit | ANTI - THEFT SYSTEM |
B3873 | Front Washer Relay Circuit | WIPER & WAHSER |
B3875 | Wiper High Speed Relay Circuit | WIPER & WAHSER |
B3922 | Front Wiper Function Select Circuit | WIPER & WAHSER |
B3933 | Air Conditioning (A/C) Evaporator Temperature Sensor Circuit Voltage Above Threshold | HVAC |
P0826 | Up and Down Shift Switch Circuit Signal Invalid | POWERTRAIN |
P0826 | Up and Down Shift Switch Circuit Actuator Stuck | POWERTRAIN |
U0073 | Control Module Communication Bus Off | ARCHITECTURE |
U0100 | Lost Communication With ECM/PCM "A" | POWERTRAIN |
U0101 | Lost Communication with TCM | POWERTRAIN |
U0155 | Lost Communication With Instrument Panel Cluster (IPC) Control Module | ARCHITECTURE |
U0164 | Lost Communication With Body Control Module (BCM) | HVAC |
U1814 | Powertrain High Speed Communication Enable Circuit | ARCHITECTURE |
U2099 | High Speed Communication Enable Circuit | ARCHITECTURE |
Trouble Code Diagnosis DTC B0283
DTC Descriptor
This diagnostic procedure supports the following DTC :
DTC B0283 Electric Rear Defrost
Circuit Description
The Body Control Module(BCM) controls the DEFOG relay circuit. When the ignition switch is in Run position and the operator has depressed the defogger switch, the Body Control Module(BCM) provides power to the DEFOG relay control circuit.
Conditions for Running the DTC
The system voltage must be between 9-16 volts.
Conditions for Setting the DTC
- The Body Control Module(BCM) detects a short to battery positive voltage in the DEFOG relay control circuit when the Body Control Module(BCM) is trying to energize the relay.
- The Body Control Module(BCM) detects that the DEFOG relay control circuit is open.
- The condition above must be present for more than 1 second.
Action Taken When the DTC Sets
- The Body Control Module(BCM) stores DTC B0283 in memory.
- The DEFOG will not operate.
Conditions for Clearing the DTC
- A current DTC clears when the malfunction is no longer present.
- A history DTC clears when the module ignition cycle counter reaches the reset threshold, without a repeat of the malfunction.
Test Description
The numbers below refer to the step numbers on the diagnostic table.
- Tests for battery positive voltage at the coil side of the dear window defogger relay. The EF25 (10A) fuse supplies power to the coil side of the DEFOG relay.
- Tests the control circuit side of the DEFOG relay for faults that cause DTC B0283.
- Listen for an audible click when the DEFOG relay operates. Command both the ON and OFF states. Repeat the commands as necessary.
- Verifies that the Body Control Module(BCM) is providing ground to the DEFOG relay.
| Step | Action | Value(s) | Yes | No |
| 1 | Did you perform the Diagnostic System Check - Vehicle? | - | Go to Step 2 | |
| 2 | - Remove the DEFOG relay.
- Connect a test lamp between the DEFOG relay Ef25(10A) fused voltage supply circuit and ground at the DEFOG relay socket.
- Turn ON the ignition, with the engine OFF.
Does the test lamp illuminate? | - | Go to Step 3 | Go to Step 8 |
| 3 | - Turn OFF the ignition.
- Test the control circuit of the DEFOG relay for a short to battery positive voltage and ground.
Did you find and correct the condition? | - | Go to Step 11 | Go to Step 4 |
| 4 | - Connect a test lamp between the Ef25 (10A) fused voltage supply circuit and the control circuit of the DEFOG relay socket.
- Turn ON the ignition, with the engine OFF.
- Using a scan tool, command the relay ON then OFF.
Does the test lamp turn ON and OFF? | - | Go to Step 6 | Go to Step 5 |
| 5 | Test the control circuit of the DEFOG relay for an open. Did you find and correct the condition? | - | Go to Step 11 | Go to Step 7 |
| 6 | Inspect for poor connections and terminal damage at the relay socket. Did you find and correct the condition? | - | Go to Step 11 | Go to Step 9 |
| 7 | Inspect for poor connections at the harness connector of the body control module (BCM). Did you find and correct the condition? | - | Go to Step 11 | Go to Step 10 |
| 8 | Repair the short to ground, poor connection or an open in the EF25(10A) fused voltage supply circuit. Did you complete the repair? | - | Go to Step 11 | - |
| 9 | Replace the DEFOG relay. Did you complete the replacement? | - | Go to Step 11 | - |
| 10 | Replace the Body Control Module (BCM). Did you complete the replacement? | - | Go to Step 11 | - |
| 11 | - Use the scan tool in order to clear the DTCs.
- Operate the vehicle within the Conditions for Running the DTC as specified in the supporting text.
Does the DTC reset? | - | Go to Step 2 | System OK |
Trouble Code Diagnostic DTC B0981
DTC Descriptor
DTC B0981 : Transmission Winter Mode Switch Short To Ground
Circuit Description
The BCM shall monitor the winter mode switch request inputs to provide capability for the driver to modify the transmission performance. For the input, the BCM shall detect momentary activations of the switch and use these events to activate/deactivate a calibratable alternate shift pattern.
The BCM shall automatically reset to the default shift pattern when the ignition switch is in the OFF position.
Conditions for Setting the DTC
The BCM detects a short to ground on the winter mode switch circuit.
Conditions for Clearing the DTC
Use the scan tool Clear DTC Information function.
Test Description
The numbers below refer to the step numbers on the diagnostic table.
- This step tests for a faulty the winter mode switch.
- This step tests for voltage input from the BCM to the winter mode switch.
- This step tests for ground integrity.
| Step | Action | Value(s) | Yes | No |
| 1 | - Install a scan tool.
- Turn the ignition ON, with the engine OFF.
- Cycle the winter mode switch while observing on the scan tool.
Does the scan tool display Active when the switch is first pressed, and then Inactive when the switch is pressed again? | - | | Go to Step 2 |
| 2 | - Remove the connector from the winter mode switch.
- Install a fused jumper wire at the switch signal circuit of the switch connector.
Does the scan tool Winter Mode indicate a status change? | - | Go to Step 7 | Go to Step 3 |
| 3 | Measure the voltage at the switch signal circuit of the switch connector. Is ignition voltage measured? | - | Go to Step 6 | Go to Step 4 |
| 4 | Measure the voltage at the switch signal circuit of the body control module (BCM). Is ignition voltage measured? | - | Go to Step 5 | Go to Step 8 |
| 5 | Test the signal circuit of the switch for an shorted condition. Did you find and correct the condition? | - | Go to Step 9 | |
| 6 | Test the ground circuit of the switch for an shorted condition. Did you find and correct the condition? | - | Go to Step 9 | |
| 7 | Replace the winter mode switch. Did you complete the replacement? | - | Go to Step 9 | - |
| 8 | Replace the BCM. Did you find and correct the condition? | - | Go to Step 9 | - |
| 9 | After the repair is complete, observe Winter Mode on the scan tool display, while cycling the switch. Does the scan tool display Active when the switch is first pressed, and then Inactive when the switch is pressed again? | - | System OK | Go to Step 1 |
Trouble Code Diagnosis DTC B1000
DTC Descriptor
DTC B1000 : Electronic Control Unit (ECU) Performance Special Memory Failure
DTC B1000 : Electronic Control Unit (ECU) Performance RAM Integrity
DTC B1000 : Electronic Control Unit (ECU) Performance ROM Integrity
DTC B1000 : Electronic Control Unit (ECU) Performance EEPROM Integrity
DTC B1000 : Electronic Control Unit (ECU) Performance Internal Electronic Failure
Diagnostic Fault Information
Circuit/System Description
The internal fault detection is handled inside the control module. No external circuits are involved.
Conditions for Running the DTC
The module runs the program to detect an internal fault when power up is commanded. The only requirements are voltage and ground. This program runs even if the voltage is out of the valid operating range.
Conditions for Setting the DTC
The module has detected an internal malfunction.
Action Taken When the DTC Sets
The module refuses all additional inputs.
Conditions for Clearing the DTC
- A current DTC clears when the malfunction is no longer present.
- A history DTC clears when the module ignition cycle counter reaches the reset threshold of 50, without a repeat of the malfunction.
Diagnostic Aids
- This DTC may be stored as a history DTC without affecting the operation of the module.
- If stored only as a history DTC and not retrieved as a current DTC, do not replace the module.
- If this DTC is retrieved as both a current and history DTC, replace the module that set the DTC.
Circuit/System Verification
If this DTC is retrieved as a current DTC, replace the module that set the DTC.
Repair Instructions
Perform the Diagnostic Repair Verification after completing the repair.
Control Module References for the non-communicating module replacement and programming.
Trouble Code Diagnosis DTC B1001
DTC Descriptor
DTC B1001 : Option Configuration Error Variant Not Programmed
Diagnostic Fault Information
Circuit/System Description
The internal fault detection is handled inside the control module. No external circuits are involved.
Conditions for Running the DTC
The only requirements are voltage and ground.
Conditions for Setting the DTC
The module has detected that the restraints ID number is not programmed.
Conditions for Clearing the DTC
- A current DTC clears when the malfunction is no longer present.
- A history DTC clears when the module ignition cycle counter reaches the reset threshold, without a repeat of the malfunction.
Circuit/System Verification
- Program the restraints ID into the body control module (BCM).
- Retrieve DTCs from the BCM. DTC B1001 should change to a history DTC.
- If the DTC remains current, replace the BCM.
Repair Instructions
Perform the Diagnostic Repair Verification after completing the repair.
Control Module References for BCM replacement and programming.
Trouble Code Diagnosis DTC B1016
DTC Descriptor
DTC B1016 :VIN Not Programmed
Diagnostic Fault Information
Circuit/System Description
The internal fault detection is handled inside the control module. No external circuits are involved.
Conditions for Running the DTC
The only requirements are voltage and ground.
Conditions for Setting the DTC
The module has detected that the VIN is not programmed.
Conditions for Clearing the DTC
- A current DTC clears when the malfunction is no longer present.
- A history DTC clears when the module ignition cycle counter reaches the reset threshold, without a repeat of the malfunction.
Circuit/System Verification
- Program the VIN information to the body control module (BCM).
- Turn the ignition OFF, wait several seconds and then turn the ignition ON.
- Retrieve DTCs from the BCM. DTC B1016 should change to a history DTC.
- If this DTC is retrieved as a current DTC, replace the module that set the DTC.
Repair Instructions
Perform the Diagnostic Repair Verification after completing the repair.
Control Module References for BCM replacement and programming.
