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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 |
|---|---|---|---|---|
Centre High Mounted Brake lamp Control | B3884 02 | B3884 04 | B3884 01 | -- |
Centre High Mounted Brake Lamp Ground | -- | 1 | -- | -- |
1. Brake Lamps Malfunction | ||||
The brake pedal position (BPP) sensor is used to sense the action of the driver application of the brake pedal. The BPP sensor provides an analogue voltage signal that will increase as the brake pedal is applied. The body control module (BCM) provides a low reference signal and a 5 V reference voltage to the BPP sensor. When the variable signal reaches a voltage threshold indicating the brakes have been applied, the BCM will apply battery voltage to the left and right brake lamp control circuits as well as the centre high mounted brake lamp control circuit illuminating the left and right brake lamps and the centre high mounted brake lamp.
| • | Battery voltage must be between 9-16 V. |
| • | Brakes applied. |
The BCM detects a short to voltage in the Centre High Mounted Brake Lamp control circuit.
The BCM detects a short to ground in the Centre High Mounted Brake Lamp control circuit.
The BCM detects an open/high resistance in the Centre High Mounted Brake Lamp control circuit.
Centre High Mounted Brake Lamp always ON.
Centre High Mounted Brake Lamp inoperative.
| • | The condition responsible for setting the DTC no longer exists. |
| • | A history DTC will clear once 100 consecutive malfunction free vehicle ON/OFF switch cycles have occurred. |
Control Module References for scan tool information
| ⇒ | If greater than the specified range, test the ground circuit for an open/high resistance. |
| ⇒ | 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. |
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
| • | Control Module References for BCM replacement, programming and setup |
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