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| • | Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. |
| • | Review Strategy Based Diagnosis for an overview of the diagnostic approach. |
| • | Diagnostic Procedure Instructions provides an overview of each diagnostic category. |
Circuit | Short to Ground | Open/High Resistance | Short to Voltage | Signal Performance |
|---|---|---|---|---|
B+ | B3101 00 | B3101 00 | -- | -- |
Serial Data - Enable Line | B3101 00 | B3101 00 | B3101 00 | B3101 00 |
Serial Data - Receive | B3101 00 | B3101 00 | B3101 00 | B3101 00 |
Low Reference | -- | B3101 00 | -- | -- |
The body control module (BCM) communicates with the remote control door lock receiver through the keyless entry serial data circuits. When any button on the keyless entry transmitter is pressed, the transmitter sends a signal to the remote control door lock receiver. The remote control door lock receiver sends a function request to the BCM, depending on which button is pressed on the transmitter. The BCM receives the message and performs the appropriate function.
A button is pressed on the keyless entry transmitter.
No response is received from the remote control door lock receiver after the BCM requests information from or sends configuration commands to the remote control door lock receiver.
In the case of power loss, the remote control door lock receiver is disabled for 65 seconds. Otherwise no action is taken.
| • | A current DTC will clear when the fault is no longer present. |
| • | A history DTC will clear after 40 consecutive ignition cycles without a fault present. |
Keyless Entry System Description and Operation
Control Module References for scan tool information
If 30 Ω or greater
| 2.1. | Ignition OFF, disconnect the harness connector at the K9 BCM. |
| 2.2. | Test for less than 2 Ω in the low reference circuit end to end. |
If 2 Ω or greater, repair the open/high resistance in the circuit.
If less than 2 Ω, replace the K9 BCM.
If less than 30 Ω
If the test lamp does not illuminate
| 4.1. | Ignition OFF, disconnect the harness connector at the K9 BCM. |
| 4.2. | Test for infinite resistance between the B+ circuit and ground. |
If less than infinite resistance, repair the short to ground on the circuit.
If Infinite resistance.
| 4.3. | Test for less than 2 Ω in the B+ circuit end to end. |
If 2 Ω or greater, repair the open/high resistance in the circuit.
If less than 2 Ω, replace the K9 BCM.
If the test lamp illuminates
If less than 3 V
| 5.1. | Ignition OFF, disconnect the harness connector at the K9 BCM. |
| 5.2. | Test for infinite resistance between the serial data circuit and ground. |
If less than infinite resistance, repair the short to ground on the circuit.
If infinite resistance
| 5.3. | Test for less than 2 Ω in the serial data circuit end to end. |
If 2 Ω or greater, repair the open/high resistance in the circuit.
If less than 2 Ω, replace the K9 BCM.
If greater than 6 V
| 5.1. | Ignition OFF, disconnect the harness connector at the K9 BCM, ignition ON. |
| 5.2. | Test for less than 1 V between the serial data circuit and ground. |
If 1 V or greater, repair the short to voltage on the circuit.
If less than 1 V, replace the K9 BCM.
If within than 3-6 V
If 1 V or greater
Repair the short to voltage on the circuit.
If less than 1 V
If less than infinite resistance
Repair the short to ground on the circuit.
If infinite resistance
If 2 Ω or greater
Repair the open/high resistance in the circuit.
If less than 2 Ω
If DTC B3101 is set as current
Replace the K9 BCM
If DTC B3101 is not set or is set as history
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
Control Module References for BCM or remote control door lock receiver replacement, programming and setup
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