GM Service Manual Online
For 1990-2009 cars only

Step

Action

Value(s)

Yes

No

1

Were you sent here from the Exterior Lights System Check?

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Go to Step 2

Go to Exterior Lights System Check

2

  1. Disconnect the junction block 1, C5.
  2. Test for continuity between junction block 1, connector C5, cavity 2 and SP450.

Does continuity exist?

--

Go to Step 3

Go to Step 4

3

Replace the junction block 1.

Is the replacement complete?

--

Go to Exterior Lights System Check

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4

Repair the poor connection or the open in the GRN wire between the junction block 1, connector C5 cavity 2 and SP450. Refer to Wiring Repairs in Wiring Systems.

Is the repair complete?

--

Go to Exterior Lights System Check

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