Captiva |
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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 |
|---|---|---|---|---|
BCM B+ Terminal 4 X4 | B3445 00 | B3445 00 | -- | -- |
Brake Pedal Position Sensor 5 V Reference | C0277 06, C0890 03, C0161 71 | C0277 06, C0161 71 | C0277 07, C0161 71 | - |
Brake Applied Signal Terminal 6 X5 | C0297 00, P0571 00 | 3 | 3 | -- |
Brake Pedal Position Sensor Signal | C0277 06, C0161 71 | C0277 06, C0161 71 | C0277 07, C0161 71 | C0277 09 |
Brake Lamp Control | B3445 00 | 1 | 1 | -- |
Brake Position Sensor Low Reference | -- | 1 | 1 | -- |
Center High Mounted Stop Lamp (CHMSL) Ground | -- | 2 | -- | -- |
Left Rear Tail/Stop Lamp Ground | -- | 1 | -- | -- |
Right Rear Tail/Stop Lamp Ground | -- | 1 | -- | -- |
1. Stop Lamps Malfunction 2. Center High Mounted Stop Lamp (CHMSL) Malfunction 3. Cruise Control 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 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 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 lamp control circuit illuminating the left and right stop lamps and the center high mounted stop lamp (CHMSL). The BCM also applies battery voltage to the transmission control module (TCM) and engine control module (ECM) via the brake applied signal circuit.
| • | Battery voltage must be between 9-16 V. |
| • | Brakes APPLIED. |
The BCM detects a short to ground in the brake applied signal circuit.
The Service Vehicle Soon indicator is commanded ON.
| • | The condition responsible for setting the DTC no longer exists. |
| • | A history DTC will clear once 100 malfunction-free ignition cycles have occurred. |
Exterior Lighting Systems Description and Operation
Control Module References for scan tool information
| • | ECM X1 - with LNP/LNQ |
| • | ECM X1 - with LF1 |
| • | ECM X1 - with LE5/LE9 |
| • | ECM terminal 78 X1 - with LNP/LNQ |
| • | ECM terminal 48 X1 - with LF1 |
| • | ECM terminal 61 X1 - with LE5/LE9 |
| ⇒ | If the test lamp is always ON, test the signal circuit for a short to voltage. If the circuit tests normal, replace the K9 BCM. |
| ⇒ | If the test lamp is always OFF, test the signal circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the K9 BCM. |
| • | ECM terminal 78 X1 - with LNP/LNQ |
| • | ECM terminal 48 X1 - with LF1 |
| • | ECM terminal 61 X1 - with LE5/LE9 |
| ⇒ | If the test lamp does not turn ON and OFF when commanded, replace the K20 ECM. |
| • | TCM terminal 3 - with Automatic Transmission - T12 |
| • | TCM terminal 48 - with Manual Transmission |
| ⇒ | If the test lamp is always ON, test the signal circuit for a short to voltage. If the circuit tests normal, replace the K9 BCM. |
| ⇒ | If the test lamp is always OFF, test the signal circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the K9 BCM. |
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
| • | Control Module References for BCM, ECM, or TCM replacement, setup, and programming |
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