GM Service Manual Online
For 1990-2009 cars only

Step

Action

Value(s)

Yes

No

DEFINITION: All stop lamps are always on.

1

Review the stoplamp operation and perform the necessary inspections.

Did you complete the system review and inspection?

--

Go to Step 2

Go to Symptoms

2

Attempt to operate the stoplamps.

Does the system operate normally?

--

Go to Testing for Intermittent Conditions and Poor Connections in Wiring Systems

Go to Step 3

3

Disconnect the TCC/Stoplamp switch.

Did the stoplamps remain on?

--

Go to Step 4

Go to Step 11

4

Disconnect the connector C202 at the convenience center.

Did the stoplamps remain on?

--

Go to Step 6

Go to Step 5

5

Repair the short to voltage in CKT 17 (WHT) between the TCC/Stoplamp switch and connector C202.

Did you complete the repair?

--

Go to Step 12

--

6

Disconnect connector C404.

Did the stoplamps remain on?

--

Go to Step 8

Go to Step 7

7

Repair the short to voltage between connector C404 and the left stoplamp.

Did you complete the repair?

--

Go to Step 12

--

8

Disconnect connector C401.

Did the stoplamps remain on?

--

Go to Step 10

Go to Step 9

9

Repair the short to voltage between connector C401 and the right stoplamp.

Did you complete the repair?

--

Go to Step 12

--

10

Repair the short to voltage in the wiring harness between C202 and connectors C401/404.

Did you complete the repair?

--

Go to Step 12

--

11

Replace the TCC/Stoplamp switch.

Is the repair complete?

--

Go to Step 12

--

12

Operate the system in order to verify the repair.

Did you correct the condition?

--

System OK

Go to Step 3