Schematic Reference: Radio/Audio System Schematics

Did you review the Radio/Audio System Description and Operation and perform the necessary inspections?

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Go to Step  2

Go to Radio/Audio System Description and Operation

1. Turn ON the ignition, with the engine OFF.
2. Turn ON the radio.
3. Operate all of the steering wheel controls (SWC).

Do all of the steering wheel controls operate properly?

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

Go to Step  3

Caution: When you are performing service on or near the SIR components or the SIR wiring, you must disable the SIR system. Refer to Disabling the SIR System. Failure to follow the correct procedure could cause air bag deployment, personal injury, or unnecessary SIR system repairs.

1. Turn OFF the ignition.
2. Disable the SIR. Refer to Disabling the SIR System in SIR.
3. Disconnect the inflatable restraint steering wheel module coil connector.
4. Turn ON the ignition, with the engine OFF.
5. Turn ON the radio.
6. Measure the voltage from the accessory voltage circuit of the inflatable restraint steering wheel module coil connector, harness side, to a good ground. Refer to Circuit Testing in Wiring Systems.

Does the voltage measure near the specified value?

12 V DC

Go to Step 4

Go to Step  5

1. Turn OFF the ignition.
2. Measure the resistance from the accessory voltage circuit to the remote radio control signal circuit of the inflatable restraint steering wheel module coil connector. Refer to Circuit Testing in Wiring Systems.
3. Press the following steering wheel controls and record the resistance values:

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Volume up

•	Volume down

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Play

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Mute

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Seek up

•

Seek down

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AM/FM

•

Pre-Set

Do the recorded resistances measure near the specified values?

1270 ohms

1564 ohms

1912 ohms

2387 ohms

3102 ohms

4282 ohms

6652 ohms

13,612 ohms

Go to Step  6

Go to Step  7

Test the accessory voltage circuit for an open, high resistance or short to ground. Refer to Circuit Testing and to Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

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Go to Step  11

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1. Remove and disconnect the radio. Refer to Radio Replacement .
2. Test the remote radio control circuit between the inflatable restraint steering wheel module coil, harness side, connector and the radio for an open, high resistance or short. Refer to Circuit Testing and to Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

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Go to Step  11

Go to Step  8

1. Test the accessory voltage circuit and test the steering wheel controls signal circuit of the inflatable restraint steering wheel module coil for an open, high resistance or short.
2. Inspect for poor connections at the harness connector of the SWC switch.

Refer to Testing for Intermittent Conditions and Poor Connections and to Connector Repairs in Wiring Systems.

Did you find and correct the condition?

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Go to Step  11

Go to Step  9

Inspect for poor connections at the harness connector of the radio. Refer to Testing for Intermittent Conditions and Poor Connections and to Connector Repairs in Wiring Systems.

Did you find and correct the condition?

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Go to Step  11

Go to Step  10

Replace the appropriate SWC switch. Refer to Steering Wheel Control Switches Replacement .

Did you complete the replacement?

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Go to Step  11

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Important:: Perform the setup procedure for the radio.

Replace the radio. Refer to Radio Replacement .

Did you complete the replacement?

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Go to Step  11

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Operate the system in order to verify the repair.

Did you correct the condition?

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System OK

Go to Step  2