Diagnostic Instructions
| • | 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. |
DTC Descriptors
DTC B3622 01: Steering Wheel Controls Signal Circuit Short to BatteryDTC B3622 08: Steering Wheel Controls Signal Circuit Signal Invalid
DTC B3622 59: Steering Wheel Controls Signal Circuit Protection Timed Out
Diagnostic Fault Information
Circuit | Short to Ground | Open/High Resistance | Short to Voltage | Signal Performance |
|---|---|---|---|---|
Remote Radio Control Supply Voltage | 1 | 1 | -- | -- |
Steering Wheel Controls Signal Circuit | 1 | 1 | B3622 01 | B3622 58, 08 |
1. Steering Wheel Controls Inoperative | ||||
Circuit/System Description
The instrument panel module (IPM) supplies voltage to the multiple momentary contact switches and monitors the return signal. Each switch is associated to a set resistance value, when pressed a specific voltage drop occurs through a series of resistors unique to that switch. The IPM identifies the selection, then sends a serial data message that is received by the component controlled, activating the feature. If equipped with adaptive cruise control the Gap+/Gap- switches are in place of the mute/source switches and are in the same resistor ladder circuit.
Conditions for Running the DTC
| • | Voltage supplied to the module is in the normal operating voltage range of 9-16 volts. |
| • | IPM in Accessory, Run or Crank power modes. |
Conditions for Setting the DTC
B3622 01
The IPM detects a short to voltage on steering wheel controls signal circuit, for more than 5 seconds.
B3622 08
The IPM detected the signal from the steering wheel controls signal circuit does not fall into a calibrated range.
B3622 59
The IPM detects that any of the steering wheel control switches is stuck, for more than 30 seconds.
Action Taken When the DTC Sets
B3622 01 and 08
The IPM does not react to any switch inputs.
B3622 59
The IPM does not react to any switch inputs of equal or lower priority. If 2 switches are closed at the same time the IPM will read the least resistive path, so that switch takes precedence over the other one.
Conditions for Clearing the DTC
| • | A current DTC clears when the malfunction is no longer present. |
| • | A history DTC clears when the module ignition cycle counter reaches the reset threshold, without a repeat of the malfunction. |
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
Connector End View Reference
Description and Operation
Steering Wheel Controls Description and Operation
Electrical Information Reference
Scan Tool Reference
Circuit/System Verification
Ignition ON, observe the scan tool steering wheel controls counts while pressing the steering wheel control switch. The reading should change with each switch pressed and display counts when inactive.
Circuit/System Testing
Caution: Refer to SIR Caution in the Preface section.
Important: It is recommended that Component Testing be performed before Circuit Testing when diagnosing steering wheel controls.
- Ignition OFF, disconnect the harness connector at the left and right steering wheel control switches.
- Ignition ON, test for B+ between the ignition circuit terminal 1 and ground at the left harness connector.
- Test for less than 0.5 volt between the signal circuit terminal 4 and ground.
- Install a 3-amp fused jumper wire at the ignition circuit terminal 1 at the left harness connector. Toggle the jumper wire between the signal circuit terminals 4 at the left and right harness connectors. Verify DTC B3622 sets.
- Reconnect the left switch.
- Test for B+ between the ignition terminal 1 and ground at the right harness connector.
- If all circuits test normal, test or replace the switch.
| ⇒ | If less than the specified value, test the ignition circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the IPM. |
| ⇒ | If greater than 0.5 volt test the signal circuit for a short to voltage. If the circuit tests normal replace the IPM. |
| ⇒ | If the DTC does not set, test the signal circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the IPM. |
| ⇒ | If less than the specified value, test the ignition circuit for a short to ground or an open/high resistance. If the circuit tests normal test or replace the left switch. |
Component Testing
- Ignition OFF, disconnect the harness connector at the steering wheel control switches.
- Test the left switch for 2,360-2,400 ohms of resistance between the ignition circuit terminal 1 and the ignition circuit terminal 5.
- Test for infinite resistance between the ignition circuit terminal 1 and the signal circuit terminal 4 with the switch in the open position.
- Test resistance values between the ignition circuit terminal 1 and the signal terminal 4 with the switch closed in each position and verify readings are approximate to what the schematic reads.
| ⇒ | If the resistance is not within the specified range, replace the faulty switch. |
| ⇒ | If less than infinite resistance, replace the switch. |
| ⇒ | If values do not match, replace the switch. |
Repair Instructions
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
| • | Control Module References for IPM replacement, setup, and programming |
