Circuit Description
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.
Conditions for Setting the DTC
| • | There is a short to CKT 187. |
| • | The system voltage is between 9.0 volts and 16.0 volts. |
| • | The above conditions exist for 184 seconds. |
Action Taken When the DTC Sets
| • | 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. |
Conditions for Clearing the MIL/DTC
| • | 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 can be cleared using a scan tool. |
Diagnostic Aids
| • | 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 Wiring Systems for intermittent and poor connections. |
Test Description
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 | Was the BCM Diagnostic System Check performed? | -- | 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? | -- | -- |
