The instrument panel cluster (IPC) supplies a regulated voltage supply to the steering wheel control switches and monitors the return signal. Each switch state is associated with a specific resistance value. When a switch is depressed a specific voltage drop occurs across the resistor unique to that switch. The IPC is able to identify which switch was depressed by recognising the voltage drop associated with that switch and responds to the selected request.

DTC B2815 04

The IPC detects an open in the steering wheel circuits for more than 5 seconds.

DTC B2815 59

The IPC detects a stuck steering wheel switch for more than 3 minutes.

Schematic Reference

Steering Wheel Secondary/Configurable Control Schematics

Connector End View Reference

Component Connector End Views

Description and Operation

Steering Wheel Controls Description and Operation

Electrical Information Reference

Scan Tool Reference

Control Module References for scan tool information

Ignition ON, while depressing the individual push button steering wheel control switches, observe the scan tool and verify the status of the individual steering wheel control switches. The following values should display depending on which switch is depressed.

Note: If DTC B2815 59 is set the steering wheel switch component test should be performed prior to continuing with component testing below.

1. Ignition OFF, disconnect the harness connector at the steering wheel switch assembly.
2. Test for less than 5 ohms between the low reference circuit terminal 5 and ground.

⇒	If greater than the specified range, test the low reference circuit for an open/high resistance. If the circuit tests normal, replace the IPC.

3. Ignition ON, test for 4.8-5.2 volts between the signal circuit terminal 6 and ground.

⇒	If less than the specified range, test the signal circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the IPC.

⇒	If greater than the specified range, test the signal circuit for a short to voltage. If the circuit tests normal, replace the IPC.

4. Test for 4.8-5.2 volts between the signal circuit terminals listed below and ground.

•	Right Steering Wheel Scroll 2 terminal 1.

•	Right Steering Wheel Scroll 1 terminal 2.

•	Left Steering Wheel Scroll 1 terminal 3.

•	Left Steering Wheel Scroll 2 terminal 4.

⇒	If less than the specified range, test the appropriate signal circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the IPC.

⇒	If greater than the specified range, test the appropriate signal circuit for a short to voltage. If the circuit tests normal, replace the IPC.

5. If all circuits test normal, replace the steering wheel control switch assembly.

1. Ignition OFF, disconnect the harness connector at the steering wheel switch assembly.
2. Test for 0.5-O.L. ohms between the scroll wheel terminals listed below, while rotating each steering wheel scroll wheel several times through its full range of motion.

•	right steering wheel scroll wheel terminal 1 and terminal 2.

•	left steering wheel scroll wheel terminal 3 and terminal 4.

⇒	If not within the specified range or is erratic, replace the steering wheel switch.

3. Test the resistance between the signal terminal 6 and the low reference terminal 5 while depressing the appropriate steering wheel controls switch button listed below.

⇒	If not the specified value, replace the steering wheel switch.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.