3-Spoke

DTC B3608 (3 - Spoke)

Diagnostic Instructions

* Perform the Diagnostic System Check - Vehicle (Initial Inspection and Diagnostic Overview) prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis (Initial Inspection and Diagnostic Overview) for an overview of the diagnostic approach.
* Diagnostic Procedure Instructions (Initial Inspection and Diagnostic Overview)provides an overview of each diagnostic category.



DTC Descriptor
DTC B3608 01
- Steering Wheel Control Entertainment Output Signal Circuit Short to Battery




Diagnostic Fault Information






Circuit/System Description

The radio supplies 10 volts to the steering wheel control momentary contact switches and monitors the return signal. Each switch state is associated to a set resistance value and when pressed a specific voltage drop across the resistor unique to the switch selected. The radio performs the desired function or sends a serial data message to the component controlled by the switch.


Conditions for Running the DTC

* The radio is in the ACCESSORY, RUN, or RAP power mode.
* The system voltage is at least 9 volts and no more than 16 volts.
* All the above conditions are present for greater than 50 ms.



Conditions for Setting the DTC

Short to voltage is 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.



Diagnostic Aids

Before diagnosis of the steering wheel controls, ensure the primary controls of the associated component are functioning properly.


Reference Information
Schematic Reference

Steering Wheel Secondary/Configurable Control Schematics (Steering Wheel Secondary/Configurable Control Schematics)
Connector End View Reference

Component Connector End Views (Connector Views)
Description and Operation

Steering Wheel Controls Description and Operation (Steering Wheel Controls Description and Operation)
Electrical Information Reference

* Circuit Testing (Component Tests and General Diagnostics)
* Connector Repairs (Component Tests and General Diagnostics)
* Testing for Intermittent Conditions and Poor Connections (Component Tests and General Diagnostics)
* Wiring Repairs (Component Tests and General Diagnostics)

Scan Tool Reference

Control Module References (Programming and Relearning)for scan tool information


Circuit/System Testing

Important: It is recommended that Component Testing is performed before Circuit Testing when diagnosing steering wheel controls.


Caution: Refer to SIR Caution (SIR Caution) .

1. Ignition OFF, disconnect the harness connector at the right steering wheel control switch.
2. Ignition ON, Radio ON, test for 9.2-10 volts between the 10-volt reference circuit terminal 2 and ground.

• If less than the specified range, test the circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the radio.
• If greater than the specified range, test the circuit for a short to voltage. If the circuit tests normal, replace the radio.

3. Test for 9.2-10 volts between the 10-volt reference circuit terminal 2 and the signal circuit terminal 4.

• If less than the specified range, test the signal circuit for an open/high resistance. If the circuit tests normal, replace the radio.
• If greater than the specified range, test the signal circuit for a short to voltage. If the circuit tests normal, replace the radio.

4. Disconnect the X1 harness connector at the radio.
5. Test for infinite resistance between the signal circuit terminal A9 and ground.

• If not the specified value, test the signal circuit for short to ground.

6. If all circuits test normal, test or replace the steering wheel control switch.



Component Testing
Caution: Refer to SIR Caution (SIR Caution) .

1. Ignition OFF, disconnect the harness connector at the right steering wheel control switch.
2. Test for infinite resistance between the signal circuit terminal 4 and the 10-volt reference terminal 2 with the switch in the open position.

• If not the specified value, replace the right steering wheel control switch.

3. Test for less than 3,200 ohms of resistance between the signal circuit terminal 4 and the 10-volt reference terminal 2 with the switch in the closed position.

• If greater than the specified value, replace the right steering wheel control switch.




Repair Instructions

Perform the Diagnostic Repair Verification (Verification Tests) after completing the diagnostic procedure.


Control Module References (Programming and Relearning)for radio replacement, setup, and programming