Were you sent here from the Foglamp Diagnostic System Check?

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Go to Step 2

Go to Foglamp Diagnostic System Check

Perform the BCM Diagnostic System Check.

Are any DTCs stored in memory?

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Go to the applicable DTC table

Go to Step 3

Remove the RR FOG LP Micro Relay #37.

Are the rear fog lamps still ON?

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Go to Step 4

Go to Step 7

1. Disconnect the underhood electrical center connectors C2 and C3.
2. Connect a DMM between:

•	the underhood electrical center connector C2 terminal A4 and ground.

•	the underhood electrical center connector C3 terminal F1 and ground.

3. Check for any present voltage on CKT 122 at these three locations.

Is voltage present on CKT 122 during any of these tests?

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Go to Step 5

Go to Step 6

Repair the short to battery voltage in CKT 34 at one of the three locations as listed in step four.

Is the repair complete?

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Go to Foglamp Diagnostic System Check

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Replace the underhood electrical center.

Is the repair complete?

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Go to Foglamp Diagnostic System Check

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1. Disconnect the body control module (BCM) connector C1.
2. Connect a DMM between the BCM connector C1 terminal B3 and ground.
3. Measure the resistance between the BCM connector C1 terminal B3 and ground.

Is the resistance within the specified values?

0-3ohms

Go to Step 8

Go to Step 9

Repair the short to ground in CKT 1901.

Is the repair complete?

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Go to Foglamp Diagnostic System Check

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1. Reconnect the underhood electrical center connectors C2 and C3.
2. Reinstall the RR FOG LP Micro Relay #37 into the underhood electrical center.

Are the fog lamps ON?

Go to Step 11

Go to Step 10

Replace the RR FOG LP Micro Relay #37.

Is the repair complete?

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Go to Foglamp Diagnostic System Check

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1. Disconnect the BCM connector C2.
2. Connect a DMM between the BCM connector C2 terminal D5 and ground
3. Check for voltage at the BCM connector C2 terminal D5.

Is voltage present on CKT 187 during this test?

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Go to Step 12

Go to Step 13

1. Disconnect the rear fog lamp switch connector.
2. Connect the DMM between the BCM connector C2 terminal D5 and ground.
3. Check for voltage at the BCM connector C2 terminal D5.

Is voltage present on CKT 187 during this test?

10.0-14.0V

Go to Step 15

Go to Step 14

Replace the BCM.

Is the repair complete?

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Go to Foglamp Diagnostic System Check

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Replace the rear fog lamp switch.

Is the replacement complete?

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Go to Foglamp Diagnostic System Check

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Repair the short to battery power in CKT 187.

Is the repair complete?

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Go to Foglamp Diagnostic System Check

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