Diagnostic Aids
| • | If the vehicle is equipped with RPO U2R or U2S the steering wheel controls are connected to the radio. |
| • | If the vehicle is not equipped with RPO U2V or U2X the steering wheel controls are connected to the CD changer which is a serviceable component of the navigation radio. |
Step | Action | Value(s) | Yes | No |
|---|---|---|---|---|
Schematic Reference : Steering Wheel Controls Schematics Connector Reference : Entertainment Connector End Views | ||||
1 | Did you perform the Entertainment System Diagnostic System Check? | -- | Go to Step 2 | |
2 |
Do all of the steering wheel controls operate properly? | -- | Go to Testing for Intermittent Conditions and Poor Connections in Wiring Systems | Go to Step 3 |
3 | Test the remote radio control supply voltage circuit for a short to ground or open. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | -- | Go to Step 10 | Go to Step 4 |
4 |
Caution: When performing service on or near the SIR components or the SIR wiring, the SIR system must be disabled. Refer to SIR Disabling and Enabling . Failure to observe the correct procedure could cause deployment of the SIR components, personal injury, or unnecessary SIR system repairs.
Are the measured resistances approximately equal to the specified values? | Mute: 1.3K ohms Source: 1.5K ohms Voice Recognition: 1.9K ohms Preset Seek: 2.4K ohms Volume Up: 3.1K ohms Volume Down: 4.3K ohms Seek Up: 7K ohms Seek Down: 14K ohms | Go to Step 5 | Go to Step 7 |
5 | Test the steering wheel controls signal circuit for a short, high resistance or an open. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | -- | Go to Step 10 | Go to Step 6 |
6 | Inspect for poor connections at the harness connector of the radio. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems. Did you find and correct the condition? | -- | Go to Step 10 | Go to Step 9 |
7 | Inspect for poor connections at the harness connector of the steering wheel radio controls. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems. Did you find and correct the condition? | -- | Go to Step 10 | Go to Step 8 |
8 | Replace the appropriate steering wheel radio control. Refer to Steering Wheel Control Switch Assembly Replacement in Steering Wheel and Column. Did you complete the replacement? | -- | Go to Step 10 | -- |
9 | Replace the radio or CD changer and perform the set up procedure for the radio if applicable. Refer to Radio Replacement or Remote CD Changer Replacement . Did you complete the replacement? | -- | Go to Step 10 | -- |
10 | Operate the system in order to verify the repair. Did you correct the condition? | -- | System OK | Go to Step 2 |
