CKT 187 is an input to the BCM. The BCM monitors CKT 187 in order to determine if the rear fog lamp circuit is shorted to ground.
• | There is a short to CKT 187. |
• | The system voltage is between 9.0-16.0 volts. |
• | The above conditions exist for 184 seconds. |
• | The immobilizer PIN will be inactive. |
• | The rear fog lamps will not change state when the following actions occur: |
- | The park lamps are turned ON. |
- | The rear fog lamp switch is pressed. |
• | A current DTC will clear after the next ignition cycle that does not contain a fault. |
• | A history DTC will clear after 100 consecutive ignition cycles without a fault present. |
• | History and current DTCs may be cleared using a scan tool. |
• | Always diagnose the first DTC that is listed on the scan tool. |
• | Verify that the scan tool displays DTC B2537 as a current code before you perform diagnostics. |
• | Inspect the rear fog lamp switch in order to determine if the switch sticks in the ON position. |
• | Inspect for loose or poor connections at all of the related components. |
• | Refer to Intermittents and Poor Connections Diagnosis in Wiring Systems. |
The numbers below refer to the step numbers on the diagnostic table.
This step tests the circuit for a short to ground.
This step tests the rear fog lamp switch for a short.
Step | Action | Value(s) | Yes | No |
---|---|---|---|---|
1 | Did you perform the BCM Diagnostic System Check? | -- | Go to Step 2 | |
Does the J 39200 digital multimeter (DMM) display the specified value? | OL (infinite) | Go to Step 3 | Go to Step 6 | |
Do not depress the fog lamp switch button. Measure the resistance between the rear fog lamp switch terminal A and terminal B. Does the J 39200 DMM display the specified value? | OL (infinite) | Go to Step 4 | Go to Step 7 | |
4 |
Does DTC B2537 set as a current code? | -- | Go to Step 5 | Go to Diagnostic Aids |
5 |
Is the repair complete? | -- | Go to Step 8 | -- |
6 | Repair the short to ground in CKT 187. Is the repair complete? | -- | Go to Step 8 | -- |
7 | Replace the rear fog lamp switch. Is the repair complete? | -- | Go to Step 8 | -- |
8 | Clear the DTCs. Is the repair complete? | -- | -- |