B3622

DTC B3622

Diagnostic Instructions

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

DTC Descriptor
DTC B3622 07
- Steering Wheel Controls Signal Circuit High Voltage

Diagnostic Fault Information





Circuit/System Description

The body control module (BCM) monitors the steering wheel control signal circuit voltage. If the voltage level is too high, damage may result in the system. When a high voltage condition is detected, the BCM will ignore the switch command.

Conditions for Running the DTC

* Battery voltage is between 9-16 V.
* The ignition is ON.

Conditions for Setting the DTC

The BCM detects a short to voltage in the steering wheel control switch signal circuit.

Action Taken When the DTC Sets

The BCM will ignore switch inputs.

Conditions for Clearing the DTC

* The condition responsible for setting the DTC no longer exists.
* A history DTC will clear once 100 consecutive malfunction free ignition cycles have occurred.

Reference Information
Schematic Reference

Steering Wheel Secondary/Configurable Control Schematics (Steering Wheel Secondary/Configurable Control Schematics)
Connector End View Reference

Component Connector End Views (Connector End Views By Name)
Description and Operation

Steering Wheel Controls Description and Operation (Steering Wheel Controls)
Electrical Information Reference

* Circuit Testing (Circuit Testing)
* Connector Repairs (Connector Repairs)
* Testing for Intermittent Conditions and Poor Connections (Testing For Intermittent Conditions and Poor Connections)
* Wiring Repairs (Wiring Repairs)

Scan Tool Reference

Control Module References (Programming and Relearning)for scan tool information

Circuit/System Testing

1. Ignition OFF, disconnect the X2 harness connector at the X85 Steering Wheel Air Bag Coil.
2. Ignition ON, test for greater than 11 V between the voltage reference circuit terminal 6 (X2) male side and ground.

• 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 K9 Body Control Module.

3. Test for greater than 11 V between the voltage reference circuit terminal 6(X2) male side and the signal circuit terminal 7 (X2) male side.

• 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 K9 Body Control Module.

4. Ignition OFF, disconnect the X2 harness connector at the K9 Body Control Module.
5. Test for infinite resistance between the signal circuit terminal 7 (X2) male side at the X85 Steering Wheel Air Bag Coil and ground.

• If less than the specified value, test the signal circuit for a short to ground.

6. If all circuits test normal, test or replace the S70R Steering Wheel Controls Switch - Right.

Component Testing

Static Test
1. Disconnect the harness connector at the X85 Steering Wheel Air Bag Coil.
2. Test the resistance between the terminals 6 (X2) female side and 7 (X2) female side of the X85 Steering Wheel Air Bag Coil.

• If any of the resistance measurements for the individual switches are not within the specified resistance values, replace the S70R Steering Wheel Controls Switch - Right.





Repair Instructions

Perform the Diagnostic Repair Verification (Verification Tests) after completing the diagnostic procedure.

* Radio and Telephone Control Switch Replacement (Radio and Telephone Control Switch Replacement)
* Control Module References (Programming and Relearning)for BCM replacement, setup, and programming