GM Service Manual Online
For 1990-2009 cars only

Step

Action

Yes

No

Schematic Reference: Adjustable Pedal Schematics

Connector End View Reference: Adjustable Pedal Connector End Views

1

Did you perform the Adjustable Pedal Diagnostic System Check?

Go to Step 2

Go to Diagnostic System Check - Adjustable Pedals

2

  1. Turn the ignition OFF.
  2. Operate the adjustable pedal switch in both directions.

Do the adjustable pedals operate in both directions?

Go to Step 3

Go to Step 4

3

  1. Turn the ignition ON with the transmission selector in PARK.
  2. Operate the adjustable pedal switch in both directions.

Do the adjustable pedals operate in both directions?

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

Go to Step 10

4

  1. Disconnect the adjustable pedal motor connector.
  2. Connect a test lamp between the motor control circuit terminals in the harness connector.
  3. Operate the adjustable pedal switch in both directions.

Does the test lamp illuminate when the switch is operated in both directions?

Go to Step 22

Go to Step 5

5

  1. Disconnect the adjustable pedal relay.
  2. Connect a test lamp from the battery voltage supply circuit terminal in the harness connector to ground.

Does the test lamp illuminate?

Go to Step 6

Go to Step 16

6

Connect a test lamp from the battery voltage supply circuit terminal to the ground circuit terminal in the adjustable pedal relay harness connector.

Go to Step 7

Go to Step 17

7

Connect a test lamp from each of the adjustable pedal switch signal circuit terminals in the adjustable pedal relay harness connector to ground while operating the switch in the appropriate directions.

Does the test lamp illuminate on each signal circuit while activated?

Go to Step 13

Go to Step 8

8

  1. Disconnect the adjustable pedal switch.
  2. Connect a test lamp from the voltage supply circuit terminal in the harness connector to ground.

Does the test lamp illuminate?

Go to Step 14

Go to Step 9

9

  1. Disconnect the adjustable pedal power relay.
  2. Connect a test lamp from the battery voltage supply circuit terminal in the BEC to ground.

Does the test lamp illuminate?

Go to Step 15

Go to Step 18

10

  1. Disconnect the adjustable pedal power relay.
  2. Connect a test lamp from the ignition voltage supply circuit terminal in the BEC to ground.

Does the test lamp illuminate?

Go to Step 11

Go to Step 19

11

Connect a test lamp from the park switch signal circuit terminal in the BEC to ground.

Does the test lamp illuminate?

Go to Step 12

Go to Step 20

12

Connect a test lamp from battery voltage to the adjustable pedal power relay ground circuit terminal in the BEC.

Does the test lamp illuminate?

Go to Step 23

Go to Step 21

13

Test the adjustable pedal motor control circuits for an open or short to ground. Refer to Circuit Testing and to Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 30

Go to Step 24

14

Test the appropriate adjustable pedal switch signal circuit for an open or short to ground. Refer to Circuit Testing and to Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 30

Go to Step 25

15

Test the voltage supply circuit to the adjustable pedal switch for an open or high resistance. Refer to Circuit Testing and to Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 30

Go to Step 23

16

Repair the open or short to ground in the battery voltage supply circuit to the adjustable pedal relay. Refer to Circuit Testing and to Wiring Repairs in Wiring Systems.

Is the repair complete?

Go to Step 30

--

17

Repair the open or high resistance in the adjustable pedal relay ground circuit. Refer to Circuit Testing and to Wiring Repairs in Wiring Systems.

Is the repair complete?

Go to Step 30

--

18

Repair the open or short to ground in the battery voltage supply circuit to the adjustable pedal power relay. Refer to Circuit Testing and to Wiring Repairs in Wiring Systems.

Is the repair complete?

Go to Step 30

--

19

Repair the open or short to ground in the ignition voltage supply circuit to the adjustable pedal power relay. Refer to Circuit Testing and to Wiring Repairs in Wiring Systems.

Is the repair complete?

Go to Step 30

--

20

Repair the open or short to ground in the park switch signal circuit to the adjustable pedal power relay. Refer to Circuit Testing and to Wiring Repairs in Wiring Systems.

Is the repair complete?

Go to Step 30

--

21

Repair the open or high resistance in the adjustable pedal power relay ground circuit. Refer to Circuit Testing and to Wiring Repairs in Wiring Systems.

Is the repair complete?

Go to Step 30

--

22

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

Did you find and correct the condition?

Go to Step 30

Go to Step 26

23

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

Did you find and correct the condition?

Go to Step 30

Go to Step 27

24

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

Did you find and correct the condition?

Go to Step 30

Go to Step 28

25

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

Did you find and correct the condition?

Go to Step 30

Go to Step 29

26

Replace the adjustable pedal motor.

Is the repair complete?

Go to Step 30

--

27

Replace the adjustable pedal power relay.

Is the repair complete?

Go to Step 30

--

28

Replace the adjustable pedal relay.

Is the repair complete?

Go to Step 30

--

29

Replace the adjustable pedal switch.

Is the repair complete?

Go to Step 30

--

30

Operate the system in order to verify the repair.

Did you correct the condition?

System OK

Go to Step 3