DTC B0525 W/O RPO CW9
Circuit Description
When the body control module (BCM) receives a left turn signal ON command from the turn signal switch, the BCM will apply voltage to the left turn signal indicator supply voltage circuit. The turn signal flasher, which is integrated within the BCM, will flash the left turn signal indicator lamp in the instrument panel cluster (IPC) simultaneously with the turn signal lamps.
DTC Descriptor
This diagnostic procedure supports the following DTC:
DTC B0525 Left Turn Signal Circuit
Conditions for Running the DTC
The battery voltage must be between 9-16 volts.
Conditions for Setting the DTC
When the BCM receives a left turn signal command and the left turn signal indicator supply voltage circuit is open, shorted to ground, or shorted to voltage
Action Taken When the DTC Sets
The left turn signal indicator in the IPC will not operate or will remain always ON.
Conditions for Clearing the MIL/DTC
| • | This DTC will clear on current status after the condition for setting the fault is corrected. |
| • | A history DTC will clear after 100 consecutive ignition cycles without a fault present. |
| • | History and current DTCs can be cleared using a scan tool. |
Test Description
The numbers below refer to the step numbers on the diagnostic table.
-
This step tests if battery positive voltage is constantly being applied to the supply voltage circuit.
-
This step tests if a condition exists in the supply voltage circuit.
-
This step tests if a condition exists in the ground circuit.
-
After replacement of the IPC, you must calibrate the new cluster for proper operation.
-
After replacement of the BCM, you must calibrate the new module for proper operation.
Step | Action | Yes | No |
|---|---|---|---|
Schematic Reference: Fog Lights Schematics Connector End View Reference: Lighting Systems Connector End Views , Displays and Gages Connector End Views , or Data Communication Connector End Views | |||
1 | Did you perform the Diagnostic System Check - Vehicle? | Go to Step 2 | |
2 |
Do the exterior turn signals operate correctly? | Go to Step 3 | |
3 |
Does the test lamp illuminate? | Go to Step 4 | Go to Step 5 |
Does the test lamp remain illuminated with each command? | Go to Step 7 | Go to Step 8 | |
Test for a short to ground, open, or high resistance in the left turn signal indicator supply voltage circuit. Refer to Circuit Testing and Wiring Repairs . Did you find and correct the condition? | Go to Step 12 | Go to Step 6 | |
Test for an open or high resistance in the ground circuit. Refer to Circuit Testing and Wiring Repairs . Did you find and correct the condition? | Go to Step 12 | Go to Step 9 | |
7 | Test the left turn signal indicator supply voltage circuit for a short to voltage. Refer to Circuit Testing and Wiring Repairs . Did you find and correct the condition? | Go to Step 12 | Go to Step 9 |
8 | Inspect for poor connections at the IPC. Refer to Circuit Testing and Wiring Repairs . Did you find and correct the condition? | Go to Step 12 | Go to Step 10 |
9 | Inspect for poor connections at the harness connector of the body control module (BCM). Refer to Circuit Testing and Wiring Repairs . Did you find and correct the condition? | Go to Step 12 | Go to Step 11 |
Replace the IPC. Refer to Control Module References for replacement, setup, and programming. Did you complete the replacement? | Go to Step 12 | -- | |
Replace the BCM. Refer to Control Module References for replacement, setup, and programming. Did you complete the replacement? | Go to Step 12 | -- | |
12 |
Does the DTC reset? | Go to Step 2 | System OK |
DTC B0525 With RPO CW9
Circuit Description
When the body control module (BCM) senses that the rear fog lamp switch signal circuit is grounded momentarily by pressing the rear fog lamp switch, the BCM energizes the rear fog lamp relay by grounding the rear fog lamp relay control circuit. The rear fog lamp indicator is also illuminated.
DTC Descriptor
This diagnostic procedure supports the following DTC:
DTC B0525 Rear Fog Lamp Relay Fault
Conditions for Running the DTC
The battery voltage must be between 9-16 volts.
Conditions for Setting the DTC
| • | When the BCM receives a rear fog lamp switch OFF command and the rear fog lamp relay control circuit is shorted to ground |
| • | When the BCM receives a rear fog lamp switch ON command and the rear fog lamp relay control circuit is shorted to voltage or open |
Action Taken When the DTC Sets
The rear fog lamps will not operate or will remain always ON.
Conditions for Clearing the MIL/DTC
| • | This DTC will clear on current status after the condition for setting the fault is corrected. |
| • | A history DTC will clear after 100 consecutive ignition cycles without a fault present. |
| • | History and current DTCs can be cleared using a scan tool. |
Test Description
The numbers below refer to the step numbers on the diagnostic table.
-
Listen for an audible click when the rear fog lamp relay operates. Command both the ON and OFF states. Repeat the commands as necessary.
-
This step tests for ground at the coil side of the rear fog lamp relay.
-
This step verifies that the BCM is providing battery positive voltage to the rear fog lamp relay.
-
This step tests if battery positive voltage is constantly being applied to the rear fog lamp relay.
-
This step tests if a condition exists in the rear fog lamp relay control circuit.
-
After replacement of the BCM, you must calibrate the new module for proper operation.
Step | Action | Yes | No |
|---|---|---|---|
Schematic Reference: Fog Lights Schematics Connector End View Reference: Lighting Systems Connector End Views or Data Communication Connector End Views | |||
1 | Did you perform the Diagnostic System Check - Vehicle? | Go to Step 2 | |
Does the rear fog lamp relay turn ON and OFF with each command? | Go to Testing for Intermittent Conditions and Poor Connections | Go to Step 3 | |
Does the test lamp illuminate? | Go to Step 4 | Go to Step 10 | |
Does the test lamp turn ON and OFF with each command? | Go to Step 8 | Go to Step 5 | |
Does the test lamp remain illuminated with each command? | Go to Step 7 | Go to Step 6 | |
Test for a short to ground, an open, or high resistance in the rear fog lamp relay control circuit and rear fog lamp switch indicator control circuit. Refer to Circuit Testing and Wiring Repairs . Did you find and correct the condition? | Go to Step 13 | Go to Step 9 | |
7 | Test for a short to voltage in the rear fog lamp relay control circuit and rear fog lamp switch indicator control circuit. Refer to Circuit Testing and Wiring Repairs . Did you find and correct the condition? | Go to Step 13 | Go to Step 9 |
8 | Inspect for poor connections at the rear fog lamp relay. Refer to Circuit Testing and Wiring Repairs . Did you find and correct the condition? | Go to Step 13 | Go to Step 11 |
9 | Inspect for poor connections at the harness connector of the body control module (BCM). Refer to Circuit Testing and Wiring Repairs . Did you find and correct the condition? | Go to Step 13 | Go to Step 12 |
10 | Repair the open or high resistance in the ground circuit of the rear fog lamp relay. Refer to Wiring Repairs . Did you complete the repair? | Go to Step 13 | -- |
11 | Replace the rear fog lamp relay. Refer to Relay Replacement . Did you complete the replacement? | Go to Step 13 | -- |
Replace the BCM. Refer to Control Module References for replacement, setup, and programming. Did you complete the replacement? | Go to Step 13 | -- | |
13 |
Does the DTC reset? | Go to Step 2 | System OK |
