B3608

DTC B3608

CIRCUIT DESCRIPTION
The steering wheel controls (SWC) is a resistor network with momentary contact switches. The contact switch corresponds with a specific resistor in the network. Each resistor has a different resistance value. When a switch is pressed, a voltage drop occurs in the resistor network producing a specific voltage value unique to the switch selected. This specific voltage value allows the radio to identify which switch was pressed. The radio responds just as if the corresponding radio front panel button had been pressed.

The radio supplies approximately 10 volts to the SWC switches on the 10 volt reference circuit. The specific voltage value from the switch returns to the radio on the steering wheel controls signal circuit.

DTC DESCRIPTOR

DTC 01:

This diagnostic procedure supports the following DTC:
DTC B3608 Steering Wheel Control Entertainment Output Signal Circuit
This Vehicle has DTCs which include DTC Symptoms. For more information on DTC Symptoms, refer to DTC Symptom Description in Vehicle DTC Information. DTC Symptom Description

CONDITIONS FOR RUNNING THE DTC
- The radio is in the ACCESSORY, RUN, or RAP power mode.
- The system voltage is at least 9.0 volts and no more than 16.0 volts.
- All the above conditions are present for greater than 50 ms.

CONDITIONS FOR SETTING THE DTC
The following conditions are present for 50 ms or longer:

ACTION TAKEN WHEN THE DTC SETS
The steering wheel control switch functions are inoperative.

CONDITIONS FOR CLEARING THE DTC
- The conditions for setting the DTC are no longer present.
- A history DTC clears after 100 malfunction free ignition cycles.
- The radio receives the clear code command from the scan tool.

TEST DESCRIPTION

Steps 1-6:

The numbers below refer to the step numbers on the diagnostic table.
2. This step verifies that the DTC is still present.
3. This step isolates the fault condition.