Circuit Description
This circuit controls the front foglamp relay coil by grounding the circuit through the body control module (BCM). This is a fault code (both history and current) that gets set when the front foglamp relay output is currently shorted to battery.
Conditions for Setting the DTC
All of the following conditions must be met:
| • | The parklamps are commanded on by either the ALC function or manually. |
| • | The front foglamp option is enabled within the body control module BCM. |
| • | Ignition one is active. |
| • | The front fog lamp relay output is on. |
Action Taken When the DTC Sets
| • | Turns off the front foglamp relay. |
| • | Stores the DTC B2533 in the BCM memory. |
Conditions for Clearing the DTC
| • | The fault state is exited upon the program return to the front foglamp relay OFF state. |
| • | The BCM goes to sleep and reinitializes with the fault cleared. |
| • | All the BCM history codes will be cleared after 100 ignition cycles (from OFF to RUN) with no current codes active during the 100 ignition cycles. |
| • | Use the scan tool. |
Diagnostic Aids
If the DTC is a history DTC, the problem may be intermittent. Try performing the above tests while wiggling the wiring and connectors. This can often cause the malfunction to appear.
Test Description
The numbers below refer to the numbers on the diagnostic table.
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This step verifies proper operation of the front fog lamp relay.
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This step determines if an open exists in CKT 1317 within the right IP wiring harness junction block.
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This step determines if a short to battery exists in CKT 1317 between the body control module (BCM) and the right IP wiring harness junction block.
Step | Action | Value(s) | Yes | No |
|---|---|---|---|---|
|
Important: A short to ground will cause an open fuse(s). Before performing this diagnostic procedure, inspect the fuse(s) for an open. | ||||
1 | Was the BCM System Check performed? | -- | Go to Step 2 | Go to the Body Control Module System Check |
Did the front foglamp relay activate? | -- | Go to Step 8 | Go to Step 3 | |
Is the measured voltage at the specified value? | 0 V | Go to Step 5 | Go to Step 4 | |
4 | Replace the right IP wiring harness junction block. Refer to Relay/Fuse Center Replacement in Wiring Systems. Is the repair complete? | -- | Go to Step 8 | -- |
Is the measured voltage at the specified value? | 0 V | Go to Step 6 | Go to Step 7 | |
6 | Replace the BCM. Refer to the following procedures: Is the repair complete? | -- | Go to Step 8 | -- |
7 | Repair the short to B+ in CKT 1317 between the BCM connector C1 terminal A2 and the right IP wiring harness junction block harness connector C1 terminal F3. Refer to Wiring Repairs in Wiring Systems. Is the repair complete? | -- | Go to Step 8 | -- |
8 | Clear the DTCs from the memory. Are the DTCs cleared from the memory? | -- | Go to the Body Control Module System Check | -- |
