GM Service Manual Online
For 1990-2009 cars only

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Schematic Reference: Starting and Charging Schematics

Connector End View Reference: Master Electrical Component List in Wiring Systems

1

Did you preform the Engine Electrical Diagnostic System Check?

Go to Step 2

Go to Diagnostic System Check - Engine Electrical

2

Turn the ignition switch to the START position.

Does the engine crank?

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

Go to Step 3

3

Turn the ignition switch to the START position.

Does the Theft Deterrent relay click?

Go to Step 7

Go to Step 4

4

  1. Disconnect the Theft Deterrent relay.
  2. Connect a test light from the supply voltage circuit of the theft deterrent relay coil circuit to ground.
  3. With the transmission in park, or clutch pedal depressed, turn the ignition switch to the start position.

Does the test light illuminate?

Go to Step 5

Go to Step 6

5

  1. Connect a test light from the supply voltage circuit of the Theft Deterrent relay coil circuit to the control circuit of the Theft Deterrent relay coil circuit.
  2. With the transmission in park, or clutch pedal depressed, turn the ignition switch to the start position.

Does the test light illuminate?

Go to Step 13

Go to Step 10

6

  1. Turn OFF the ignition.
  2. Disconnect the Park Neutral Position (PNP) switch or Clutch Pedal Position switch.
  3. Turn ON the ignition, with the Engine OFF.
  4. Connect a 10 amp fused jumper between the Theft Deterrent relay coil control circuits of the PNP switch or Clutch Pedal Position switch.
  5. With the transmission in park, or clutch pedal depressed, turn the ignition switch to the start position.

Does the test lamp illuminate?

Go to Step 14

Go to Step 11

7

  1. Turn OFF the ignition.
  2. Disconnect the Theft Deterrent relay.
  3. Connect a test lamp between the battery positive voltage circuit of the Theft Deterrent relay switch circuit and a good ground.

Does the test lamp illuminate?

Go to Step 8

Go to Step 18

8

Connect a 30 amp fused jumper between the battery positive voltage circuit of the Theft Deterrent relay switch circuit and the supply voltage circuit of the starter solenoid.

Does the engine crank?

Go to Step 13

Go to Step 9

9

Does the fuse in the jumper open?

Go to Step 19

Go to Step 12

10

Test the control circuit of the Theft Deterrent relay for an open or high resistance. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 25

Go to Step 15

11

Test the supply voltage circuit of the Theft Deterrent relay coil circuit for an open or high resistance. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 25

Go to Step 16

12

Test the supply voltage circuit of the starter solenoid for an open or high resistance. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 25

Go to Step 17

13

Inspect for poor connections at the Theft Deterrent relay. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 25

Go to Step 20

14

    • If equipped with an Automatic Transmission Inspect for poor connection at the PNP switch harness connector. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems.
    • If equipped with a Manual Transmission inspect for poor connection at the Clutch Pedal Position switch harness connector. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 25

Go to Step 21

15

Inspect for poor connections at the BCM harness connector. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 25

Go to Step 22

16

Inspect for poor connections at the ignition switch harness connector. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 25

Go to Step 23

17

Inspect for poor connections at the starter solenoid. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 25

Go to Step 24

18

Repair the open or high resistance in the battery positive voltage circuit of the Theft Deterrent relay switch circuit. Refer to Wiring Repairs in Wiring Systems.

Did you complete the repair?

Go to Step 25

--

19

Repair the short to ground in the supply voltage circuit of the starter solenoid. Refer to Wiring Repairs in Wiring Systems.

Did you complete the repair?

Go to Step 25

--

20

Replace the Theft Deterrent relay.

Did you complete the replacement?

Go to Step 25

--

21

Replace the:

    • PNP switch. Refer to Park/Neutral Position Switch Replacement in Automatic Transmission - 4L60 - E.
    • Clutch Pedal Position switch. Refer to Clutch Pedal Position Switch Replacement in Manual Transmission - MM6.

Did you complete the replacement?

Go to Step 25

--

22

IMPORTANT:: Perform the set up procedures for the BCM.

Replace the BCM. Refer to Body Control Module Replacement in Body Control System.

Did you complete the replacement?

Go to Step 25

--

23

Replace the Ignition Switch. Refer to Ignition and Start Switch Replacement in Instrument Panel, Gages, and Console.

Did you complete the replacement?

Go to Step 25

--

24

Replace the starter. Refer to Starter Motor Replacement .

Did you complete the replacement?

Go to Step 25

--

25

Operate the system for which the symptom occurred.

Did you correct the condition?

System OK

Go to Step 2