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

  1. Disconnect the stoplamp/BTSI switch connector C1.
  2. Measure the voltage to ground at the stoplamp/BTSI switch connector C1 terminal A (ORN).

Is battery voltage measured?

--

Go to Step 3

Go to Step 4

3

Connect a fused jumper between the stoplamp/BTSI switch connector C1 terminal A (ORN) and terminal B (LT BLU).

Do the stoplamps light?

--

Go to Step 5

Go to Step 6

4

Repair the open in CKT 1540 (ORN). Refer to Wiring Repairs in Wiring Systems.

Is the repair complete?

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Go to Exterior Lights System Check

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5

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

Is the repair complete?

--

Go to Exterior Lights System Check

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6

Inspect CKT 20 (LT BLU) for an open between the stoplamp/BTSI switch and S202. Refer to Testing for Continuity in Wiring Systems.

Is CKT 20 OK?

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Go to Step 7

Go to Step 8

7

Replace the turn/hazard switch (USA only). Refer to Turn Signal and Multifunction Switch Assembly - Disassemble - Off Vehicle in Steering Wheel and Column - Tilt.

Is the repair complete?

--

Go to Exterior Lights System Check

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8

Repair the suspect wiring. Refer to Wiring Repairs in Wiring Systems.

Is the repair complete?

--

Go to Exterior Lights System Check

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