GM Service Manual Online
For 1990-2009 cars only

Step

Action

Value(s)

Yes

No

1

  1. Disconnect C400.
  2. Place the headlamp switch in the PARK position.
  3. Using a test light, probe between C400 terminal E (male side) and ground.

Does the test light illuminate?

--

Go to Step 3

Go to Step 2

2

Repair a poor connection in circuit 9, between S204 and C400 terminal E.

Has the repair been made?

--

Go to Exterior Lights System Check

--

3

Using a test light, probe between C400 terminal E and terminal A.

Does the test light illuminate?

--

Go to Step 5

Go to Step 4

4

Repair a poor connection or open in circuit 350 between C400 terminal A and G302.

Has the repair been made?

--

Go to Exterior Lights System Check

--

5

  1. Reconnect C400.
  2. Using a test light, backprobe the left tail/stop/turn lamp connector terminal B to ground.

Does the test light illuminate?

--

Go to Step 7

Go to Step 6

6

Repair a poor connection or an open in circuit 9 between C400 terminal E and S407.

Has the repair been made?

--

Go to Exterior Lights System Check

--

7

Repair a poor connection or open in circuit 350 between S402 and C400 terminal A.

Has the repair been made?

--

Go to Exterior Lights System Check

--