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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 |
|---|---|---|---|---|
Reverse Gear Signal | 1 | 1 | 1 | 1, 2 |
1. Reverse Gear Lamp Inoperative 2. Reverse Gear Lamp Always ON | ||||
When the automatic transmission is placed in the reverse position, the transmission control module (TCM) sends a serial data message to the body control module (BCM). The message indicates that the gear selector is in the reverse position. The BCM applies battery voltage to the reverse lamps. The reverse lamps are permanently grounded. Once the driver moves the gear selector out of the reverse position, a message is sent by the TCM via serial data requesting the BCM to remove battery voltage from the reverse lamp control circuit.
Exterior Lighting Systems Description and Operation
Control Module References for scan tool information
Ignition ON, perform the Reverse Lamps Relay test. The reverse lamp should be ON/OFF.
Observe the parameter Tap Up/Down Switch when putting the gear selector in the reverse position. The parameter Tap Up/Down Switch should display that reverse gear is engaged.
| ⇒ | If the Tap Up/Down Switch parameter displays the corresponding gear, replace the K9 Body Control Module. |
| ⇒ | If the Tap Up/Down Switch parameter does not display the corresponding gear, refer to Transmission Control Lever Malfunction . |
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
| • | Control Module References for BCM replacement, setup and programming |
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