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 provide an overview of each diagnostic category. |
DTC Descriptor
DTC B3624: Steering Wheel Controls Entertainment Signal 2 CircuitDiagnostic Fault Information
Circuit | Short to Ground | Open/High Resistance | Short to Voltage | Signal Performance |
|---|---|---|---|---|
B+ Voltage Reference | 1 | 1 | 1 | -- |
10-Volt Reference | 1 | 1 | 1 | -- |
Steering Wheel Control Switch Signal | 1 | 1 | 1 | -- |
Steering Wheel Control Switch 2 Signal | B3624 | 1 | 1 | B3624 |
1. Steering Wheel Controls Inoperative | ||||
Circuit/System Description
The body control module (BCM) supplies voltage to the MUTE/SEEK + multiple momentary contact switch and monitors the steering wheel control switch 2 signal circuit. Each switch state is associated with a set resistance value and when the switch is pressed, a specific voltage drops across the resistor unique to that switch.
Conditions for Running the DTC
| • | Battery voltage is between 9-16 volts |
| • | The ignition is ON. |
Conditions for Setting the DTC
| • | The BCM detects a short to ground on the steering wheel controls 2 signal circuit. |
| • | The steering wheel controls 2 signal circuit remains in the same state for 1 minute. |
Action Taken When the DTC Sets
The MUTE/SEEK + switch remains in the last selected position.
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
This diagnostic is for the audio steering wheel controls for vehicles not equipped with RPO K59 adaptive cruise.
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 Data List
Control Module References for scan tool information
Circuit/System Testing
- Ignition OFF, disconnect the harness connector at the left steering wheel control switch.
- Ignition ON, test for B+ between the voltage reference circuit terminal 1 and ground.
- Test for B+ between the voltage reference circuit terminal 1 and the signal circuit terminal 2.
- Ignition OFF, disconnect the X1 harness connector at the BCM.
- Test for infinite resistance between the signal circuit terminal 1 and ground.
- If all circuits test normal, test or replace the left steering wheel control switch.
| ⇒ | If less than the specified value, test the voltage reference circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the BCM. |
| ⇒ | If less than the specified value, test the signal circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the BCM. |
| ⇒ | If less than the specified value, test the signal circuit for a short to ground. |
Component Testing
- Disconnect the harness connector at the left steering wheel control switch.
- Connect a DMM between terminals 1 and 2 of the left steering wheel control switch.
| ⇒ | If any of the resistance measurements for the individual switches are not within the specified resistance values, replace the right steering wheel control switch. |
Function Switch | Minimum Resistance Value | Maximum Resistance Value |
|---|---|---|
Seek | 1.9k Ohms | 2.1k Ohms |
Mute | 4.9k Ohms | 5.1k Ohms |
Repair Instructions
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
| • | Control Module References for BCM replacement, setup, and programming |
