B3622

DTC B3622

Circuit Description
The instrument panel module (IPM) interfaces with an 8-position steering wheel resistive ladder. These switches are used for entertainment purposes and cruise control purposes if the vehicle is equipped with adaptive cruise control. The steering wheel switch network is fed by the remote radio control head ACC supply voltage. The return signal to the IPM is provided by steering column radio control signal circuit. The output voltage must be read by an A/D in order to carry out a ratiometric read which will be used to determine which, if any, switch has been activated.

DTC Descriptor
This diagnostic procedure supports the following DTC:

DTC B3622 Steering Wheel Controls Signal Circuit

This vehicle has DTCs which include DTC Symptoms. For more information on DTC Symptoms, refer to DTC Symptom Description.





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 column radio control signal circuit, for more than 5 seconds.

B3622 08
The IPM detected signal from the steering column radio control signal circuit doesn't 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.
The following are the correct resistance value ranges and counts displayed by IPM. The counts displayed by the scan tool proportionally vary with battery voltage.

Step 1 - Step 9:

Step 10: