For 1990-2009 cars

Step | Action | Value(s) | Yes | No
--- | --- | --- | --- | ---
DEFINITION: With the radio operating normally, the rear speakers do not mute and the Rear Seat Audio (RSA) power indicator does not illuminate when the RSA power button is pressed.
1 | Did you perform the Radio/Audio Diagnostic System Check? | -- | Go to Step 2 | Go to Diagnostic System Check - Radio/Audio System
2 |

1. Turn the ignition to accessory.
2. Turn the radio on and adjust the fade and balance controls to mid range.
3. Press the power button on the Rear Seat Audio (RSA) control.

Do the Rear Speakers mute?

--

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

Go to Step 3

3 | Did the volume increase greatly when the RSA power button was pressed? | -- | Go to Step 7 | Go to Step 4
4 | Press any function on the Steering Wheel Controls (SWC). Did the SWC function operate normally? | -- | Go to Step 5 | Go to Steering Wheel Controls Inoperative
5 | Using A DMM, test for RSA/SWC reference power voltage by backprobing the radio connector. Is the voltage indicated within the specified range? | 10-12 Volts | Go to Step 8 | Go to Step 6
6 | Test the RSA/SWC reference power circuit at the RSA for:

• | an open

• | high resistance

• | or poor connection

Refer to:

• | Circuit Testing

• | Wiring Repairs

• | Testing for Intermittent Conditions and Poor Connections

• | Connector Repairs

in Wiring Systems.

Did you find and correct the condition?

--

Go to Step 16

Go to Step 8

7 | Is the loud volume present in the front speakers? | -- | Go to Step 9 | Go to Step 10
8 | Can the radio volume be controlled normally when the fade control is at the full rear setting and the full front setting? | -- | Go to Step 12 | Go to Step 2
9 | Test the ground circuit of the RSA for:

• | an open

• | high resistance

• | or poor connection

Refer to:

• | Circuit Testing

• | Wiring Repairs

• | Testing for Intermittent Conditions and Poor Connections

• | Connector Repairs

in Wiring Systems.

Did you find and correct the condition?

--

Go to Step 16

Go to Step 15

10 | Test the radio rear seat audio control enable signal circuit between the radio and the RSA for:

• | an open

• | high resistance

• | short to ground

• | or poor connection

Refer to:

• | Circuit Testing

• | Wiring Repairs

• | Testing for Intermittent Conditions and Poor Connections

• | Connector Repairs

in Wiring Systems.

Did you find and correct the condition?

--

Go to Step 16

Go to Step 9

11 |

1. Using a test light, backprobe the radio connector at the rear seat audio control enable signal circuit.
2. Press the power button on the RSA control on and off.

Does the test light illuminate on one button press and go off on the next button press?

--

Go to Step 15

Go to Step 14

12 | Test the radio rear seat audio control signal circuit between the radio and the RSA for:

• | an open

• | high resistance

• | short to ground

• | short to battery voltage

• | or poor connection

Refer to:

• | Circuit Testing

• | Wiring Repairs

• | Testing for Intermittent Conditions and Poor Connections

• | Connector Repairs

in Wiring Systems.

Did you find and correct the condition?

--

Go to Step 16

Go to Step 13

13 |

1. Connect the radio harness connector and the RSA connector.
2. Turn the ignition to accessory.
3. Turn the radio on.
4. Using a DMM backprobe the RSA connector at the radio rear seat audio control signal.
5. Press the RSA power button on and of while observing the meter display.

Does the meter display a momentary voltage reading as the RSA power button is pressed?

--

Go to Step 14

Go to Step 15

14 | Replace the radio. Refer to: Radio Replacement Did you complete the repair? | -- | Go to Step 16 | --
15 | Replace the RSA control. Refer to: Rear Seat Audio Control Replacement Did you complete the repair? | -- | Go to Step 16 | --
16 | Operate the system in order to verify the repair. Did you correct the condition? | -- | System OK | Go to Step 2