GM Service Manual Online
For 1990-2009 cars only

Step

Action

Value(s)

Yes

No

Important: In order to avoid misdiagnosis, check for powertrain control module (PCM) DTCs. Refer to Engine Controls.

1

  1. Disconnect the starter relay.
  2. Connect a test lamp between underhood electrical center 2 terminal C6 and B+.
  3. While observing the test lamp, turn the ignition switch to the RUN position.

Does the test lamp light?

--

Go to Step 2

Go to Step 6

2

  1. Connect a test lamp between underhood electrical center 2 terminal B4 and ground.
  2. Depress the clutch pedal (manual transmission).
  3. Place the vehicle in park (automatic transmission).
  4. While observing the test lamp, turn the ignition switch to the START position.

Does the test lamp light?

--

Go to Step 3

Go to Step 7

3

Connect a test lamp between underhood electrical center 2 terminal C4 and ground.

Does the test lamp light?

--

Go to Step 4

Go to Step 10

4

  1. Disconnect circuit 6 (PPL wire) from the starter solenoid.
  2. Connect a 20A fused jumper from circuit 6 (PPL wire) to ground.
  3. Connect a test lamp from underhood electrical center terminal C4 to terminal B6.

Does the test lamp light?

--

Go to Step 5

Go to Step 11

5

  1. Test circuit 6 for a poor connection at the starter solenoid.
  2. If the connection is OK, replace the starter motor.

Is the repair complete?

--

System OK

--

6

  1. Test for a poor connection in circuit 625 between the body control module (BCM) and the underhood electrical center 2.
  2. Test for an open in circuit 625 between the BCM and the underhood electrical center 2.
  3. Test circuit 625 for a short to B+.
  4. If circuit 625 is OK, replace the BCM. Refer to Body Control Module Replacement .

Is the repair complete?

--

System OK

--

7

Is the vehicle equipped with a manual transmission?

--

Go to Step 8

Go to Step 9

8

  1. Test for an open or poor connection in circuit 1443 between the underhood electrical center 2 terminal B4 and the clutch pedal position switch.
  2. Test for an open or poor connection in circuit 1035 between the clutch pedal position switch and C200.
  3. If the circuits are OK, replace the clutch pedal position switch. Refer to Clutch Pedal Position Switch Replacement .

Is the repair complete?

--

System OK

--

9

  1. Test for an open or poor connection in circuit 1443 between the underhood electrical center 2 terminal B4 and the park neutral position switch.
  2. Test for an open or poor connection in circuit 1035 between the park neutral position switch and C200.
  3. If the circuits are OK, adjust or replace the park/neutral position switch. Refer to Park/Neutral Position Switch Replacement or Park/Neutral Position Switch Adjustment .

Is the repair complete?

--

System OK

--

10

Repair the open in circuit 2 between the underhood electrical center terminal C4 and S183.

Is the repair complete?

--

System OK

--

11

Repair the open or poor connector in circuit 6 between the starter solenoid and the underhood electrical center 2.

Is the repair complete?

--

System OK

--