GM Service Manual Online
For 1990-2009 cars only

Step

Action

Value(s)

Yes

No

1

Turn the ignition to ON

Does the AUTO PARK lamp illuminate?

--

Go to Step 2

Go to Step 3

2

Refer to the instructions above for dealing with an intermittent problem.

Is the repair complete?

--

System OK

--

3

Move the shift lever to NEUTRAL.

Does the AUTO PARK lamp illuminate?

--

Go to Step 4

Go to Step 9

4

  1. Disconnect the park brake pressure indicator switch.
  2. Use a DMM J 39200 to measure voltage between the connector terminal A and ground.

Does the DMM indicate the specified voltage?

11-14 v

Go to Step 6

Go to Step 5

5

Repair the open in CKT 639 (PNK) between terminal A of the park brake pressure indicator switch and splice S169.

Is the repair complete?

--

System OK

--

6

Use a DMM J 39200 to measure resistance between terminal A and terminal B of the park brake pressure indicator switch.

Does the DMM indicate the specified resistance?

Less than 2 ohms

Go to Step 8

Go to Step 7

7

Replace the park brake pressure indicator switch.

Is the repair complete?

--

System OK

--

8

Repair the open between terminal B of the park brake pressure indicator switch and splice S362. This includes the following components:

    • CKT 907 (LT BLU) between terminal B of the park brake pressure indicator switch and diode D300
    • Diode D300
    • CKT 1844 (LT GRN) between diode D300 and splice S362

Is the repair complete?

--

System OK

--

9

Use a DMM J 39200 to backprobe between terminal 2 of the of the I/P cluster connector and ground.

Does the DMM indicate the specified voltage?

11-14 v

Go to Step 10

Go to Step 11

10

Replace the AUTO PARK lamp.

Is the repair complete?

--

System OK

--

11

Repair the open in CKT 1844 (LT GRN) between splice S362 and terminal 2 of the I/P cluster connector.

Is the repair complete?

--

System OK

--