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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 |
|---|---|---|---|---|
Left Front Indicator Lamp Control | B3948 02 | B3948 04 | B3948 01 | -- |
Right Front Indicator Lamp Control | B3949 02 | B3949 04 | B3949 01 | -- |
Left Rear Indicator Lamp Control | B3950 02 | B3950 04 | B3950 01 | -- |
Right Rear Indicator Lamp Control | B3951 02 | B3951 04 | B3951 01 | -- |
Left Repeater Lamp Control | B3948 02 | 8 | B3948 01 | - |
Right Repeater Lamp Control | B3949 02 | 9 | B3949 01 | -- |
Left Indicator Switch Signal | 2 | 2 | 2 | -- |
Right Indicator Switch Signal | 3 | 3 | 3 | -- |
Left Tail Lamp Ground | - | 6 | -- | -- |
Left Repeater Lamp Ground | - | 8 | -- | -- |
Right Repeater Lamp Ground | - | 9 | -- | -- |
Right Tail Lamp Ground | - | 7 | -- | -- |
Indicator/Multifunction Switch Ground | -- | 1 | -- | -- |
Left Front Indicator Lamp Ground | -- | 4 | -- | -- |
Right Front Indicator Lamp Ground | - | 5 | -- | -- |
1. All Indicators Lamps and/or Indicators Inoperative 2. Left Indicators Malfunction 3. Right Indicators Malfunction 4. Left Front Indicator Malfunction 5. Right Front Indicator Malfunction 6. Left Rear Indicator Malfunction 7. Right Rear Indicator Malfunction 8. Left Repeater Lamp Malfunction 9. Right Repeater Lamp Malfunction | ||||
Ground is applied at all times to the indicator/multifunction switch. The indicator lamps may only be activated with the ignition switch in the ON or START position. When the indicator/multifunction switch is placed in either the TURN RIGHT or TURN LEFT position, ground is applied to the body control module (BCM) through either the right turn or left indicator switch signal circuit. The BCM then applies a pulsating voltage to the front and rear indicator lamps through there respective voltage supply circuits. When a indicator request is received by the BCM, a serial data message is sent to the instrument cluster requesting the respective indicator indicator be pulsed ON and OFF.
Exterior Lighting Systems Description and Operation
Control Module References for scan tool information
Ignition ON, observe the scan tool Right Indicator Switch parameter and Left Indicator Switch parameter while switching the S78 Indicator/Multifunction Switch between the left and right positions. The readings should toggle between ACTIVE and INACTIVE.
| ⇒ | If the readings do not change between the commanded states, refer to Indicator Switch Malfunction. |
| ⇒ | If the readings change between the commanded states and the instrument cluster indicator indicators are inoperative, refer to Indicator Indicators Malfunction. |
| ⇒ | If the test lamp does not illuminate, test the ground circuit for an open/high resistance. |
| ⇒ | If not the specified value, test the signal circuit terminal 1 for a short to ground. If the circuit tests normal, replace the K9 Body Control Module. |
| ⇒ | If not the specified value, test the signal circuit terminal 7 for a short to ground. If the circuit tests normal, replace the K9 Body Control Module. |
| ⇒ | If not the specified value, test the signal circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the K9 Body Control Module. |
| ⇒ | If not the specified value, test the signal circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the K9 Body Control Module. |
| • | E4LF Indicator Lamp - Left Front ground circuit terminal 2 |
| • | E4RF Indicator Lamp - Right Front ground circuit terminal 2 |
| • | E4LR Indicator Lamp - Left Rear ground circuit terminal 3 |
| • | E4RR Indicator Lamp - Right Rear ground circuit terminal 3 |
| • | E4Y Indicator Repeater Lamp - Left ground circuit terminal 2 |
| • | E4Z Indicator Repeater Lamp - Right ground circuit terminal 2 |
| ⇒ | If greater than the specified range, test the ground circuit for an open/high resistance. |
| • | E4LF Indicator Lamp - Left Front control circuit terminal 1 |
| • | E4RF Indicator Lamp - Right Front control circuit terminal 1 |
| • | E4LR Indicator Lamp - Left Rear control circuit terminal 2 |
| • | E4RR Indicator Lamp - Right Rear control circuit terminal 2 |
| • | E4Y Indicator Repeater Lamp - Left ground circuit terminal 1 |
| • | E4Z Indicator Repeater Lamp - Right ground circuit terminal 1 |
| ⇒ | If the test lamp is always ON, test the control circuit for a short to voltage. If the circuit tests normal, replace the K9 Body Control Module. |
| ⇒ | If the test lamp is always OFF, test the control circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the K9 Body Control Module. |
Ignition ON, command the All Indicators test ON and OFF with the scan tool, verify both indicator indicators changes between turn ON and OFF.
| ⇒ | If both indicator indicators change between illuminate and not illuminate during the test, replace the K9 Body Control Module. |
| ⇒ | If one or both indicator indicators do not illuminate during the test or remain illuminated at all times, replace the P16 Instrument Cluster. |
| ⇒ | If less than the specified value, replace the S78 Indicator/Multifunction Switch. |
| ⇒ | If less than the specified value, replace the S78 Indicator/Multifunction Switch. |
| ⇒ | If greater than the specified value, replace the S78 Indicator/Multifunction Switch. |
| ⇒ | If greater than the specified value, replace the S78 Indicator/Multifunction Switch. |
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
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