GM Service Manual Online
For 1990-2009 cars only

Step

Action

Value(s)

Yes

No

1

Was the Cruise Control System Check performed?

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Go to Step 2

Go to Cruise Control System Check

2

  1. Disconnect the electrical connector at the cruise control module.
  2. Turn the ignition switch to the RUN position.
  3. Connect a test lamp between cruise control module connector cavity D of CKT 420(PPL) and ground.
  4. Depress the brake pedal.

Does the lamp remain lit?

--

Go to Step 3

Go to Step 4

3

  1. Connect a test lamp from CKT 1320 (LT BLU) cavity G to ground.
  2. Depress the brake pedal.

Does the test lamp light?

--

Go to Step 9

Go to Step 7

4

  1. Disconnect the electrical connector at the stoplamp switch.
  2. Connect a test lamp between the stoplamp switch connector cavity C CKT 420 (PPL) and ground.

Does the test lamp light?

--

Go to Step 5

Go to Step 6

5

Locate and repair the short to the voltage between the stoplamp switch and the cruise control module.

Is the repair complete?

--

Go to Cruise Control System Check

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6

Adjust or replace the stoplamp switch.

Is the repair complete?

--

Go to Cruise Control System Check

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7

Does the CHMSL operate properly?

--

Go to Step 8

Go to Exterior Lights System Check

8

Locate and repair the open circuit or high resistance in CKT 1320 (LT BLU) between the cruise control module connector  G and underhood fuse block connector C1 terminal F11.

Is the repair complete?

--

Go to Cruise Control System Check

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9

Inspect the terminals for proper contact.

Are the contacts clean?

--

Go to Step 11

Go to Step 10

10

Clean the contacts as necessary.

Is the repair complete?

--

Go to Cruise Control System Check

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11

Replace the cruise control module Cruise Control Module Replacement .

Is the repair complete?

--

Go to Cruise Control System Check

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