C1091-ABS BRAKE LAMP CONTROL CIRCUIT HIGH
 |
For a complete wiring diagram, refer to the Wiring Information.
| NOTE: |
The Electronic Stability Control (ESC) may also be referred to as Electronic Stability Program (ESP) depending on the vehicle model year and configuration. Certain components may also reference ESP, ESC, or use the traction control symbol. |
When Set:
When monitoring the Brake Lamp Activation Relay Control circuit the module detects a short to B+.
Possible Causes |
|---|
| (B401) BRAKE LAMP ACTIVATION RELAY CONTROL SHORTED TO VOLTAGE |
| BRAKE LAMP ACTIVATION RELAY |
| ANTI-LOCK BRAKE SYSTEM (ABS) MODULE |
1. CHECK FOR DTC C1091-ABS BRAKE LAMP CONTROL CIRCUIT HIGH
| NOTE: | This DTC must be active for the results of this test to be valid. |
| 1. | Turn the ignition on. |
| 2. | With the scan tool, record and erase the DTCs. |
| 3. | Start the engine. |
| 4. | Apply the brake pedal firmly with at least 80 bar (1160 psi.). |
| 5. | With the scan tool, read the DTCs. |
Does the scan tool display: C1091-ABS BRAKE LAMP CONTROL CIRCUIT HIGH?
Yes
- Go To 2
No
- Perform the ABS-INTERMITTENT CONDITION TEST. (Refer to 28 - DTC-Based Diagnostics/MODULE, Antilock Brake (ABS) - Standard Procedure).
2. CHECK CONNECTOR/TERMINAL FOR DAMAGE
| NOTE: | Check all terminals for broken, bent, pushed out or corroded terminals. |
| 1. | Turn the ignition off. |
| 2. | Inspect the ABS Module harness connector and the Brake Lamp Activation Relay harness connector. |
Is the ABS Module or any of the connectors/terminals damaged?
Yes
- Repair as necessary.
- Perform the ABS VERIFICATION TEST. (Refer to 28 - DTC-Based Diagnostics/MODULE, Antilock Brake (ABS) - Standard Procedure).
No
- Go To 3
3. (B401) BRAKE LAMP ACTIVATION RELAY CONTROL SHORTED TO VOLTAGE
 |
| 1. | Turn the ignition off. |
| 2. | Disconnect the ABS Module harness connector. |
| 3. | Disconnect the Brake Lamp Activation Relay harness connector. |
| 4. | Turn the ignition on. |
| 5. | Using a 12-volt test light connected to ground, probe the (B401) Brake Lamp Activation Relay Control Circuit at the Brake Lamp Activation Relay harness connector. |
Does the test light illuminate brightly?
Yes
- Repair the short to voltage in the (B401) Brake Lamp Activation Relay Control circuit.
- Perform the ABS VERIFICATION TEST. (Refer to 28 - DTC-Based Diagnostics/MODULE, Antilock Brake (ABS) - Standard Procedure).
No
-
Go To 4
4. BRAKE LAMP ACTIVATION RELAY
 |
| 1. | Turn the ignition off. |
| 2. | Measure the resistance across the relay between the (B401) Brake Lamp Activation Relay Control Circuit and the (F941) Fused Run/Start Relay Output. |
Is the resistance 75 Ohms ± 5 Ohms?
Yes
- Replace the Anti-Lock Brake (ABS) Module in accordance with the service information.
- Perform the ABS VERIFICATION TEST. (Refer to 28 - DTC-Based Diagnostics/MODULE, Antilock Brake (ABS) - Standard Procedure).
No
- Replace the Brake Lamp Activation Relay in accordance with the Service Information.
- Perform the ABS VERIFICATION TEST. (Refer to 28 - DTC-Based Diagnostics/MODULE, Antilock Brake (ABS) - Standard Procedure).