• Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure.
• Review Strategy Based Diagnosis for an overview of the diagnostic approach.
• Diagnostic Procedure Instructions provides an overview of each diagnostic category.

For symptom byte information refer to Symptom Byte List.

The steering wheel controls are divided into a right-hand set and left-hand set. The right–hand switch communicates with the IPC (Instrument Panel Cluster) through serial data and provides input from the rear left–hand switch and rear right–hand switch. The IPC identifies the switch selection and activates the feature.

Ignition ON.

An internal electrical malfunction has been detected in the steering wheel controls switch.

A stuck switch has been detected in the steering wheel controls switch.

No action is taken.

The DTC will clear when the conditions for setting the DTC are no longer present.

Steering Wheel Secondary/Configurable Control Schematics

Master Electrical Component List

Instrument Cluster Description and Operation

• Circuit Testing
• Connector Repairs
• Testing for Intermittent Conditions and Poor Connections
• Wiring Repairs

Control Module References for scan tool information

1. Ignition ON.
2. Verify all the associated primary controls on the radio (Volume, Mute, Seek, etc.) operate properly.
• If any of the primary controls do not function properly

  Refer to Symptoms - Entertainment.

• If all of the primary controls function properly
3. Verify the IPC scan tool Steering Wheel Control Switches parameter changes when pressing the S70R Steering Wheel Controls Switch – Right buttons.
• If the parameter does not change for some of the S70R Steering Wheel Controls Switch – Right switches

  Replace S70R Steering Wheel Controls Switch – Right.

• If the parameter does not change for all of the S70R Steering Wheel Controls Switch – Right switches

  Refer to S70R Steering Wheel Controls Switch Circuit/System Testing.

• If the parameter changes for all S70R Steering Wheel Controls Switch – Right buttons
4. Verify the IPC scan tool Steering Wheel Control Switches parameter changes between Volume Up and Volume Down when depressing the S70F Steering Wheel Controls Switch – Radio Volume switch.
• If the parameter does not change

  Refer to S70F Steering Wheel Controls Switch – Radio Volume Circuit/System Testing.

• If the parameter changes
5. Verify the IPC scan tool Steering Wheel Control Switches parameter changes between Next Preset and Previous Preset when depressing the S70E Steering Wheel Controls Switch – Radio Presets switch.
• If the parameter does not change

  Refer to S70E Steering Wheel Controls Switch – Radio Presets Circuit/System Testing.

• If the parameter changes
6. All OK.

1. Ignition OFF and all vehicle systems OFF, disconnect the harness connector at the S70F Steering Wheel Controls Switch – Radio Volume. It may take up to 2 min for all vehicle systems to power down.
2. Test for less than 10 Ω between the ground circuit terminal 3 and ground.
• If 10 Ω or greater
1. Ignition OFF.
2. Test for less than 2 Ω in the ground circuit end to end.
• If 2 Ω or greater, repair the open/high resistance in the circuit.
• If less than 2 Ω, repair the open/high resistance in the ground connection.
• If less than 10 Ω
3. Ignition ON.
4. Test for greater than 4.5 V between the signal circuit terminals listed below and ground:
• Terminal 1
• Terminal 2
• If 4.5 V or less
1. Ignition OFF, disconnect the harness connector at the S70R Steering Wheel Controls Switch – Right.
2. Test for infinite resistance between the signal circuit and ground.
• If less than infinite resistance, repair the short to ground on the circuit.
• If infinite resistance
3. Test for less than 2 Ω in the signal circuit end to end.
• If 2 Ω or greater, repair the open/high resistance in the circuit.
• If less than 2 Ω, test or replace the S70R Steering Wheel Controls Switch – Right.
• If greater than 4.5 V
5. Install a 3 A fused jumper wire between the signal circuit terminal 1 and the ground circuit terminal 3.
6. Verify the IPC scan tool Steering Wheel Control Switches parameter is Volume Down Button.
• If not Volume Down Button

  Test or replace the S70R Steering Wheel Controls Switch – Right.

• If Volume Down Button
7. Remove the jumper wire. Install a 3 A fused jumper wire between the signal circuit terminal 2 and the ground circuit terminal 3.
8. Verify the IPC scan tool Steering Wheel Control Switches parameter is Volume Up Button.
• If not Volume Up Button

  Test or replace the S70R Steering Wheel Controls Switch – Right.

• If Volume Up Button
9. Test or replace the S70F Steering Wheel Controls Switch – Radio Volume.

1. Ignition OFF and all vehicle systems OFF, disconnect the harness connector at the S70E Steering Wheel Controls Switch – Radio Presets. It may take up to 2 min for all vehicle systems to power down.
2. Test for less than 10 Ω between the ground circuit terminal 3 and ground.
• If 10 Ω or greater
1. Ignition OFF.
2. Test for less than 2 Ω in the ground circuit end to end.
• If 2 Ω or greater, repair the open/high resistance in the circuit.
• If less than 2 Ω, repair the open/high resistance in the ground connection.
• If less than 10 Ω
3. Ignition ON.
4. Test for greater than 4.5 V between the signal circuit terminals listed below and ground:
• Terminal 1
• Terminal 2
• If 4.5 V or less
1. Ignition OFF, disconnect the harness connector at the S70R Steering Wheel Controls Switch – Right.
2. Test for infinite resistance between the signal circuit and ground.
• If less than infinite resistance, repair the short to ground on the circuit.
• If infinite resistance
3. Test for less than 2 Ω in the signal circuit end to end.
• If 2 Ω or greater, repair the open/high resistance in the circuit.
• If less than 2 Ω, test or replace the S70R Steering Wheel Controls Switch – Right.
• If greater than 4.5 V
5. Install a 3 A fused jumper wire between the signal circuit terminal 1 and the ground circuit terminal 3.
6. Verify the IPC scan tool Steering Wheel Control Switches parameter is Next Preset.
• If not Next Preset

  Test or replace the S70R Steering Wheel Controls Switch – Right.

• If Next Preset
7. Remove the jumper wire. Install a 3 A fused jumper wire between the signal circuit terminal 2 and the ground circuit terminal 3.
8. Verify the IPC scan tool Steering Wheel Control Switches parameter is Previous Preset.
• If not Previous Preset

  Test or replace the S70R Steering Wheel Controls Switch – Right.

• If Previous Preset
9. Test or replace the S70E Steering Wheel Controls Switch – Radio Presets.

1. Ignition OFF, disconnect the harness connector X1 at the P16 Instument Cluster.
2. Disconnect the harness connector at the S70R Steering Wheel Controls Switch – Right. Ignition ON.
3. Test for less than 1 V between the S70R Steering Wheel Controls Switch – Right serial data circuit terminal 2 and ground.
• If greater than 1 V

  Repair the short to voltage on the circuit.

• If less than 1 V
4. Ignition OFF.
5. Test for infinite resistance between the serial data circuit terminal 2 and ground.
• If less than infinite resistance

  Repair the short to ground on the circuit.

• If infinite resistance
6. Replace the S70R Steering Wheel Controls Switch – Right.

1. Ignition OFF, disconnect the harness connector at the S70F Steering Wheel Controls Switch – Radio Volume.
2. Test for infinite resistance between the following signal terminals and the ground terminal 3 with the switch in the open position.
• Terminal 1
• Terminal 2
• If less than infinite resistance on either circuit

  Replace the S70F Steering Wheel Controls Switch – Radio Volume.

• If infinite resistance
3. Test for less than 10 Ω between the following signal terminals and the ground terminal 3 with the S70F Steering Wheel Controls Switch – Radio Volume in the Up position or Down position.
• Terminal 1
• Terminal 2
• If 10 Ω or greater

  Replace the S70F Steering Wheel Controls Switch – Radio Volume.

• If less than 10 Ω
4. Ignition OFF, disconnect the harness connector at the S70E Steering Wheel Controls Switch – Radio Presets.
5. Test for infinite resistance between the following signal terminals and the ground terminal 3 with the switch in the open position.
• Terminal 1
• Terminal 2
• If less than infinite resistance on either circuit

  Replace the S70E Steering Wheel Controls Switch – Radio Presets.

• If infinite resistance
6. Test for less than 10 Ω between the following signal terminals and the ground terminal 3 with the S70E Steering Wheel Controls Switch – Radio Presets in the Up position or Down position.
• Terminal 1
• Terminal 2
• If 10 Ω or greater

  Replace the S70E Steering Wheel Controls Switch – Radio Presets.

• If less than 10 Ω
7. All OK

Perform the Diagnostic Repair Verification after completing the repair.

Control Module References for control module replacement, programming and setup.