Did you perform the Starting System Check ?

--

Go to Step 2

Go to Starting System Check

1. Place gear selector in the PARK position.
2. Turn the ignition switch to START.
3. Observe the SECURITY indicator.

Does the indicator stay on or flash continuously?

--

Go to Vehicle Theft Deterrent (VTD) System Check

in Theft Deterrent

Go to Step 3

Perform the battery load test. Refer to Battery Not Operating Properly .

Is the battery OK?

--

Go to Step 5

Go to Step 4

Replace the battery. Refer to Battery Replacement.

Is the repair complete?

--

Go to Step 36

--

Check the battery cables and connections.

Are the battery cables and connections OK?

--

Go to Step 7

Go to Step 6

Repair the battery cable connections or replace battery cables as needed. Refer to Battery Cable .

Is the repair complete?

--

Go to Step 36

--

1. Remove the appropriate injector fuse(s) from the I/P fuse block to prevent the engine from starting:

•	Buick: INJ fuse.

•	Oldsmobile: INJ 1 fuse and INJ 2 fuse.

2. Turn the ignition switch to START.
3. Using a J 39200 digital multimeter (DMM), measure the voltage from the starter solenoid terminal S to ground.

Is the measured voltage greater than the specified value?

8 V

Go to Step 8

Go to Step 9

1. Check for poor terminal contact at starter solenoid terminal S.
2. Check for a dirty or poor ground between the starter motor and the engine block. Refer to Starter Motor Inspection .
3. If OK, replace the starter motor. Refer to Starter Motor Replacement .

Is the repair complete?

--

Go to Step 36

--

1. Disconnect the starter lead CKT 6 (PPL) from the starter solenoid.
2. Turn the ignition switch to START.
3. Using a DMM, measure the voltage from the theft deterrent relay terminal A2 to ground.

Is the measured voltage greater than the specified value?

8 V

Go to Step 10

Go to Step 11

Repair the open or short to ground in CKT 6 (PPL).

Is the repair complete?

--

Go to Step 36

--

1. Turn the ignition switch to OFF.
2. Reconnect the starter lead CKT 6 (PPL) to the starter solenoid.
3. Connect a DMM between battery positive voltage (B+) and the park/neutral position (PNP) switch connector C1 terminal G.
4. Turn the ignition switch to START.

Is the measured voltage within the specified range?

10-15V

Go to Step 12

Go to Step 19

1. Connect a DMM between the theft deterrent relay terminal C2 and ground.
2. Place the ignition switch in the START position.

Is the measured voltage within the specified range?

10-15V

Go to Step 14

Go to Step 13

1. Remove the CRANK fuse from the IP fuse block.
2. Connect a DMM between the CRANK fuse terminal C14 and ground.
3. Place the ignition switch in the START position.

Is the measured voltage within the specified range?

10-15V

Go to Step 24

Go to Step 27

1. Turn the ignition switch to the START position.
2. Using a DMM, measure the voltage from the theft deterrent relay terminal C1 to ground.

Is the measured voltage within the specified range?

10-15V

Go to Step 16

Go to Step 15

Repair the open in CKT 5 (YEL) between S223 and the theft deterrent relay.

Is the repair complete?

--

Go to Step 36

--

Check for an open in CKT 575 (YEL).

Is the circuit OK?

--

Go to Step 18

Go to Step 17

Repair the open in CKT 575 (YEL).

Is the repair complete?

--

Go to Step 36

--

1. Inspect the theft deterrent relay socket for poor terminal contact.
2. If OK, replace the theft deterrent relay. Refer to Theft Deterrent Relay Replacement in Theft Deterrent.

Is the repair complete?

--

Go to Step 36

--

1. Connect a DMM between battery positive voltage (B+) and the PNP switch connector C1 terminal E.
2. Turn the ignition switch to START.

Is the measured voltage within the specified range?

10-15V

Go to Step 20

Go to Step 21

Replace the park/neutral position (PNP) switch. Refer to Park/Neutral Position Switch Replacement in Automatic Transaxle 4T65-E or Park/Neutral Position Switch Replacement in Automatic Transaxle 4T80-E .

Is the repair complete?

--

Go to Step 36

--

Check for an open in CKT 625 (YEL/BLK).

Is the circuit OK?

--

Go to Step 23

Go to Step 22

Repair the open in CKT 625 (YEL/BLK).

Is the repair complete?

--

Go to Step 36

--

1. Inspect the theft deterrent module connector for poor terminal contact.
2. If OK, replace the theft deterrent module. Refer to Theft Deterrent Module Replacement in Theft Deterrent.

Is the repair complete?

--

Go to Step 36

--

Check the CRANK fuse in the IP fuse block for an open.

Is the fuse OK?

--

Go to Step 26

Go to Step 25

1. Repair the short to ground in CKT 806 (PPL).
2. Replace the CRANK fuse in the IP fuse block.

Is the repair complete?

--

Go to Step 36

--

Repair the open in CKT 806 (PPL).

Is the repair complete?

--

Go to Step 36

--

1. Turn the ignition switch to START.
2. Using a DMM, measure the voltage from the theft deterrent relay terminal C1 to ground.

Is the measured voltage greater than the specified value?

8 V

Go to Step 28

Go to Step 29

Repair the open in CKT 5 (YEL) between S223 and the IP fuse block.

Is the repair complete?

--

Go to Step 36

--

Connect a DMM from connector C202 terminal D5 to ground.

Is the measured voltage within the specified range?

10-15V

Go to Step 30

Go to Step 33

Check for an open in CKT 5 (YEL) between S223 and connector C202.

Is the circuit OK?

--

Go to Step 32

Go to Step 31

Repair the open in CKT 5 (YEL).

Is the repair complete?

--

Go to Step 36

--

Replace the ignition switch. Refer to Ignition and Key Alarm Switch Assembly - Disassemble - Off Vehicle and Ignition and Key Alarm Switch Assembly - Assemble - Off Vehicle in Steering Wheel and Column - Tilt.

Is the repair complete?

--

Go to Step 36

--

Check the IGN 3 fuse in the RH rear fuse block for an open.

Is the fuse OK?

--

Go to Step 35

Go to Step 34

1. Repair the short to ground in CKT 1442 (RED).
2. Replace the IGN SW fuse in the RH rear fuse block.

Is the repair complete?

--

Go to Step 36

--

Repair the open in CKT 1442 (RED).

Is the repair complete?

--

Go to Step 36

--

1. Make sure any components removed during diagnosis are installed in place and that all connectors are connected.
2. Repeat the system check. Refer to Starting System Check .

Is the system check complete?

--

System OK

--