GM Service Manual Online
For 1990-2009 cars only

Step

Action

Value(s)

Yes

No

1

Did you perform the Radio/Audio System Check?

--

Go to Step 2

Go to Steering Wheel Control System Check

2

  1. Using a test light, backprobe between connector C205 terminal A to ground.
  2. Turn the ignition switch on.

Is the test light on?

--

Go to Step 4

Go to Step 3

3

Repair poor connection or open in circuit 43.

Is the repair complete?

--

Go to Steering Wheel Control System Check

--

4

  1. Disconnect C205.
  2. Connect a DMM between C205 (female side) terminal A and terminal C.
  3. Press each of the left steering wheel control buttons one at a time.

Are all the resistances approximately equal to the specified values?

    â€¢ Volume Up: 294ohms
    â€¢ Volume Down: 348ohms
    â€¢ Source: 475
    â€¢ Mute: 715
    â€¢ Seek Up: 1180ohms
    â€¢ Seek Down: 2370
    â€¢ Scan: 6980ohms

Go to Step 8

Go to Step 5

5

  1. Disconnect the left radio control switch.
  2. Connect a DMM between the left radio control switch pigtail harness connector terminal A and terminal C.
  3. Press each of the left steering wheel control buttons, one at a time.

Are all the resistances approximately equal to the specified values?

    â€¢ Volume Up: 294ohms
    â€¢ Volume Down: 348ohms
    â€¢ Source: 475
    â€¢ Mute: 715
    â€¢ Seek Up: 1180ohms
    â€¢ Seek Down: 2370
    â€¢ Scan: 6980ohms

Go to Step 7

Go to Step 6

6

Replace the left radio control switch. Refer to Steering Wheel Control Switches Replacement for service procedure.

Is the repair complete?

--

Go to Steering Wheel Control System Check

--

7

Replace the inflatable restraint steering wheel module coil. Refer to Inflatable Restraint Steering Wheel Module Coil Replacement in SIR for service procedure.

Is the repair complete?

--

Go to Steering Wheel Control System Check

--

8

  1. Using a test light, backprobe between the radio harness connector terminal E6 to ground.
  2. Turn the ignition switch on.

Is the test light on?

--

Go to Step 9

Go to Step 10

9

Repair short to B+ on circuit 1796.

Is the repair complete?

--

Go to Steering Wheel Control System Check

--

10

Using a DMM, measure the resistance between the radio harness connector terminal E6 and ground.

Is the resistance measured same as the specified value?

∞

Go to Step 12

Go to Step 11

11

Repair short to ground in circuit 1796.

Is the repair complete?

--

Go to Steering Wheel Control System Check

--

12

Test for poor connection or open in circuit 1796.

Did you find a poor connection or open in circuit 1796?

--

Go to Step 13

Go to Step 14

13

Repair poor connection or open in circuit 1796.

Is the repair complete?

--

Go to Steering Wheel Control System Check

--

14

Service the radio. Refer to Radio Replacement for service procedure.

Is the repair complete?

--

Go to Steering Wheel Control System Check

--