For 1990-2009 cars

Step | Action | Value | Yes | No
--- | --- | --- | --- | ---
Schematic Reference: Radio/Navigation System Schematics Connector End View Reference: Component Connector End Views
1 | Did you perform the Diagnostic System Check - Vehicle? | -- | Go to Step 2 | Go to Diagnostic System Check - Vehicle
2 |

1. Engine off, ignition on.
2. Turn ON the radio.
3. Operate all of the steering wheel controls.

Do all of the steering wheel controls operate properly?

--

Go to Testing for Intermittent Conditions and Poor Connections

Go to Step 3

3 | Does one or more of the steering wheel control switches operate properly? | -- | Go to Step 8 | Go to Step 4
4 | Warning: Refer to SIR Warning in the Preface section.

1. Engine off, ignition on.
2. Press and hold the steering wheel control select down switch.
3. Measure the resistance between the remote radio control supply voltage circuit and the radio control signal circuit.

Is the resistance measured within the specified value?

2148-2625 ohms

Go to Step 5

Go to Step 9

5 | Test the remote radio control supply voltage circuit for a short to ground or an open. Refer to Circuit Testing and Wiring Repairs. Did you find and correct the condition? | -- | Go to Step 11 | Go to Step 6
6 | Test the remote radio control signal circuit for a high resistance or an open. Refer to Circuit Testing and Wiring Repairs. Did you find and correct the condition? | -- | Go to Step 11 | Go to Step 7
7 | Inspect for poor connections at the harness connector of the instrument panel module. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs. Did you find and correct the condition? | -- | Go to Step 11 | Go to Step 10
8 | Inspect for poor connections at the harness connector of the steering wheel controls. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs. Did you find and correct the condition? | -- | Go to Step 11 | Go to Step 9
9 | Replace the steering wheel control switch. Refer to Steering Wheel Control Switch Assembly Replacement for replacement, setup, and programming. Is the repair complete? | -- | Go to Step 11 | --
10 | Replace the instrument panel module (IPM). Refer to Control Module References for replacement, setup, and programming. Is the repair complete? | -- | Go to Step 11 | --
11 | Operate the system in order to verify the repair. Is the failure removed? | -- | System OK | Go to Step 2