GM Service Manual Online
For 1990-2009 cars only

Step

Action

Value(s)

Yes

No

1

Was the entire steering wheel control system check performed?

--

Go to Step 2

Go to Steering Wheel Control System Check

2

Turn the radio on.

Are all of the radio functions operating normally?

--

Go to Step 3

Go to Step 4

3

  1. Disconnect Connector C217.
  2. Measure the resistance with a DMM, probing between C217 (female side) terminals A and term C while pressing each of the steering wheel radio control buttons.
  3. Compare the resistance values to the chart following the diagnosis table.

Are the resistance values approximately equal?

--

Go to Step 5

Go to Step 6

4

  1. Disconnect the radio connector C3.
  2. Inspect circuit 1796 for a short to B+ or ground.

Is a short present?

--

Go to Step 7

Go to Step 10

5

Inspect circuit 1796 for an open or a poor connection.

Is there an open or a poor connection?

--

Go to Step 8

Go to Step 10

6

Inspect the SIR coil for an open or a poor connection. Refer to Disabling the SIR System .

Is there an open or a poor connection?

--

Go to Step 8

Go to Step 9

7

Repair the short to B+ or ground.

Is the repair complete?

--

Go to Step 11

--

8

Repair the open or the poor connection in circuit 1796.

Is the repair complete?

--

Go to Step 11

--

9

Replace the steering wheel controls. Refer to Steering Wheel Control Switches Replacement .

Is the repair complete?

--

Go to Step 11

--

10

Repair the radio. Refer to Radio Replacement Radio Replacement .

Is the repair complete?

--

Go to Step 11

--

11

  1. Turn the ignition switch to the OFF position.
  2. Reconnect all connectors/components removed.

Have all repairs been made?

--

Go to Steering Wheel Control System Check

--

Controls

Value

VOL (UP)

1270ohms

VOL (DOWN)

1564ohms

PLAY

1912ohms

MUTE

2387ohms

SEEK (UP)

3102ohms

SEEK (DOWN)

4282ohms

AM/FM

6652ohms

PRESET

13632ohms