Mute/Gap (+)

1248-1292

204-243

Source/Gap (-)

1537-1591

174-203

Schematic Reference: Cruise Control Schematics

Connector End View Reference: Master Electrical Component List in Wiring Systems

Did you perform the Diagnostic System Check - Vehicle?

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Go to Step 2

Go to Diagnostic System Check - Vehicle in Vehicle DTC Information

Caution: Refer to SIR Caution in the Preface section.

1. Turn OFF the ignition.
2. Disable the inflatable restraint steering wheel module. Refer to SIR Disabling and Enabling in SIR.
3. Remove the inflatable restraint steering wheel module. Refer to Inflatable Restraint Steering Wheel Module Replacement in SIR.
4. Disconnect C277.
5. Turn ON the ignition, with the engine OFF.
6. Connect a test lamp between the remote radio control head accessory supply voltage circuit and a good ground.

Does the test lamp illuminate?

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Go to Step 3

Go to Step 10

1. Turn OFF the ignition.
2. With a DMM, measure the resistance between the remote radio control head accessory supply voltage circuit and the adaptive cruise control (ACC) gap adjustment/radio control signal circuit.
3. While measuring the resistance, press and hold the Mute/Gap (+) steering wheel control switch.

Does the resistance measure within the specified range?

1248-1292 ohms

Go to Step 4

Go to Step 6

While measuring the resistance, press and hold the Source/Gap (-) steering wheel control switch.

Does the resistance measure within the specified range?

1537-1591 ohms

Go to Step 5

Go to Step 9

Test the ACC gap adjustment/radio control signal circuit between C277 and the instrument panel module (IPM) for the following:

Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

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Go to Step 13

Go to Step 8

Test the remote radio control head accessory supply voltage circuit between C277 and the steering wheel controls switch for an open or for a high resistance

Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

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Go to Step 13

Go to Step 7

Test the ACC gap adjustment/radio control signal circuit between C277 and the steering wheel controls switch for the following:

Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

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Go to Step 13

Go to Step 9

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

Did you find and correct the condition?

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Go to Step 13

Go to Step 11

Inspect for poor connections at the harness connector of the steering wheel control switch assembly. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems.

Did you find and correct the condition?

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Go to Step 13

Go to Step 12

Repair the following in the remote radio control head accessory supply voltage circuit.

Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you complete the repair?

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Go to Step 13

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Replace the IPM. Refer to Control Module References in Computer/Integrating Systems for replacement, setup, and programming.

Did you complete the replacement?

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Go to Step 13

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Replace the steering wheel control switch assembly. Refer to Steering Wheel Control Switch Assembly Replacement in Steering Wheel and Column.

Did you complete the replacement?

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Go to Step 13

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1. Install the inflatable restraint steering wheel module. Refer to Inflatable Restraint Steering Wheel Module Replacement in SIR.
2. Enable the inflatable restraint steering wheel module. Refer to SIR Disabling and Enabling in SIR.
3. Operate the system in order to verify the repair.

Did you correct the condition?

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Go to Step 2

System OK