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. Turn the ignition switch to the ON position.
  2. Place the headlamp switch in the ON position.
  3. Use a test lamp to backprobe junction block 2, C3 cavity 9 to ground.

Does the test lamp illuminate?

--

Go to Step 3

Go to Step 4

3

Use a J 35616-200 to backprobe junction block 1, C6 cavity 9 to ground.

Does the test lamp illuminate?

--

Go to Step 5

Go to Step 6

4

Connect a J 36169-A between cavity 3 of the TAIL relay and ground.

Do the park and tail lamps illuminate?

--

Go to Step 8

Go to Step 7

5

Repair the open in the GRN wire between the junction block 1, C6 cavity 9 and the junction block 2, C3 cavity 9. Refer to Wiring Repairs in Wiring Systems.

Is the repair complete?

--

Go to Exterior Lights System Check

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6

Replace junction block 1.

Is the replacement complete?

--

Go to Exterior Lights System Check

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7

Replace the TAIL Relay.

Is the replacement complete?

--

Go to Exterior Lights System Check

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8

Test for continuity between cavity 6 of connector C3 of junction block 2 and cavity 16 of the DRL control module connector using a J 39200 .

Is there continuity in the LT GRN wire?

--

Go to Step 9

Go to Step 10

9

Test for continuity between cavity 14 of the turn/signal/headlamp switch connector and cavity 17 of the DRL control module connector using a J 39200 .

Is there continuity in the LT GRN/BLK wire?

--

Go to Step 12

Go to Step 11

10

Repair the open in the LT GRN wire between cavity 6 of connector C3 of junction block 2 and cavity 16 of the DRL control module connector . Refer to Wiring Repairs in Wiring Systems.

Is the replacement complete?

--

Go to Exterior Lights System Check

--

11

Repair the open in the LT GRN/BLK wire between cavity 17 of the DRL control module connector and cavity 14 of the turn signal/headlamp switch. Refer to Wiring Repairs in Wiring Systems.

Is the replacement complete?

--

Go to Exterior Lights System Check

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12

Replace the DRL module. Refer to Daytime Running Lights (DRL) Control Module Replacement .

Is the replacement complete?

--

Go to Exterior Lights System Check

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