GM Service Manual Online
For 1990-2009 cars only

Step

Action

Value(s)

Yes

No

1

Did you perform the necessary inspections?

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Go to Step 2

Go to Diagnostic Starting Point

2

Connect a test lamp between the trailer tow harness (in the right rear corner) CKT 940 (ORN) to ground.

Does the test lamp illuminate?

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Go to Step 4

Go to Step 3

3

Repair the open in CKT 940 (ORN).

Refer to Wiring Repairs .

Did you complete the repair?

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Go to Step 4

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4

Operate the system in order to verify the repair.

Did you correct the condition?

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System OK

Go to Step 2