• | 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 |
---|---|---|---|---|
STOP/TRN Fuse B+ | 1 | 1 | -- | -- |
Brake Pedal Position Sensor 10-Volt Reference | C0283, C0870 | C0277 | C0277 | -- |
Brake Pedal Position Sensor Signal | C0283 | C0277 | C0277 | -- |
Brake Pedal Position Sensor Low Reference | -- | C0277 | 1 | -- |
Center High Mounted Stop Lamp (CHMSL) Control | B3445 | 2 | 2 | -- |
Left Rear Stop/Turn Lamp Control | B3950 | B3950 | 1 | -- |
Right Rear Stop/Turn Lamp Control | B3951 | B3951 | 1 | -- |
Center High Mounted Stop Lamp (CHMSL) Ground | -- | 2 | -- | -- |
Left Rear Stop/Turn Lamp Ground | -- | 1 | -- | -- |
Right Rear Stop/Turn Lamp Ground | -- | 1 | -- | -- |
1. Stop Lamps Malfunction 2. Center High Mounted Stop Lamp (CHMSL) Malfunction |
The brake pedal position sensor is used to sense the action of the driver application of the brake pedal. The brake pedal position sensor provides an analog voltage signal that will increase as the brake pedal is applied. The body control module (BCM) provides a low reference signal and a 10-volt reference voltage to the brake pedal position sensor. When the variable signal reaches a voltage threshold indicating the brakes have been applied, the BCM will apply battery voltage to the stop lamps, transmission control module (TCM), engine control module (ECM), electronic brake control module (EBCM), and center high mounted stop lamp (CHMSL).
Exterior Lighting Systems Description and Operation
Control Module References for scan tool information
⇒ | If the reading does not change as the brake pedal is applied and released, refer to Brake Pedal Position Sensor (BPPS) Malfunction. |
⇒ | If the LR turn signal does not illuminate when commanded, refer to Stop Lamps Malfunction. |
⇒ | If the RR turn signal does not illuminate when commanded, refer to Stop Lamps Malfunction. |
⇒ | If the less than the specified range, test the B+ circuit for a short to ground or an open/high resistance. |
⇒ | 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 BCM. |
⇒ | 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 BCM. |
⇒ | 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 BCM. |
⇒ | 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 BCM. |
⇒ | If the test lamp illuminates, test the low reference circuit for a short to voltage. If the circuit tests normal, replace the BCM. |
⇒ | If less than the specified range, test the10-volt reference circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the BCM. |
⇒ | If greater than the specified range, test the 10-volt reference circuit for a short to voltage. If the circuit tests normal, replace the BCM. |
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
• | Control Module References for BCM replacement, setup, and programming |