GM Service Manual Online
For 1990-2009 cars only

Step

Action

Value(s)

Yes

No

1

Was the Exterior Lights System Check performed?

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Go to Step 2

Go to Exterior Lights System Check .

2

Disconnect the stoplamp switch connector.

Do the stoplamps go out?

--

Go to Step 3

Go to Step 4

3

Replace the stoplamp switch. Refer to Stop Lamp Switch Replacement in Hydraulic Brakes.

Is the repair complete?

--

Go to Exterior Lights System Check

--

4

  1. Turn the ignition switch to the LOCK position.
  2. Disconnect the Electronic Brake Control Module (EBCM) connector C1.

Do the stoplamps go out?

--

Refer to Diagnosis of the EBCM in Antilock Brake System

Go to Step 5

5

Repair the short to voltage in the GRN/WHT wire between the following components:

    • The left rear combination lamp
    • The right rear combination lamp
    • The stoplamp switch
    • The EBCM
    • The center high mounted stoplamp

Refer to Wiring Repairs in Wiring Systems.

Is the repair complete?

--

Go to Exterior Lights System Check

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