• | 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. |
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 |
The CD changer supplies voltage to the steering wheel control momentary contact switches and monitors the return signal. 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 the switch. The CD changer identifies the switch selected and activates the feature.
Steering Wheel Secondary/Configurable Control Schematics
Steering Wheel Controls Description and Operation
Control Module References for scan tool information
⇒ | If greater than the specified range, test the voltage reference circuit for a short to voltage. If the circuit tests normal, replace the CD changer. |
⇒ | If less than the specified range, test the voltage reference circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the CD changer. |
• | Steering wheel control switch signal circuit terminal 6 - left switch |
• | Steering wheel control switch signal circuit terminal 2 - right switch |
⇒ | If less than the specified range, test the signal circuits for a short to voltage or an open/high resistance. If the circuits test normal, replace the CD changer. |
• | Steering wheel control switch signal circuit terminal 6 - left switch |
• | Steering wheel control switch signal circuit terminal 2 - right switch |
⇒ | If less than the specified value, test the signal circuit for a short to ground. |
⇒ | If greater than the specified range, test the voltage reference circuit for a short to voltage |
⇒ | If not the specified value, test the voltage reference circuit for a short to ground. |
⇒ | If greater than the specified range, test the voltage reference circuit for a an open/high resistance. |
⇒ | 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 |
---|---|---|
Previous | 1.1k Ohms | 1.4k Ohms |
Next | 1.5k Ohms | 1.7k Ohms |
Volume Up | 1.8k Ohms | 2.1k Ohms |
Volume Down | 2.2k Ohms | 2.6k Ohms |
Mute/Voice Recognition | 2.9k Ohms | 3.3k Ohms |
No Switch Pressed | O.L. | O.L. |
Function Switch | Minimum Resistance Value | Maximum Resistance Value |
---|---|---|
Source | 1.0k Ohms | 1.4k Ohms |
No Switch Pressed | O.L. | O.L. |
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
• | 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. |
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 |
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.
This diagnostic is for the audio steering wheel controls for vehicles not equipped with RPO K59 adaptive cruise.
Steering Wheel Secondary/Configurable Control Schematics
Steering Wheel Controls Description and Operation
Control Module References for scan tool information
⇒ | 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. |
⇒ | 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 |
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
• | Control Module References for BCM replacement, setup, and programming |