B2510

DTC B2510 Steering Wheel Controls HVAC Key Stuck:

Wiring Schematic:

CIRCUIT DESCRIPTION
The IPC monitors the steering wheel controls HVAC (cellular phone) keys (switches) input at the IPC connector C2 terminal B11. The IPC interprets the switch commands and issues the appropriate class 2 message.

CONDITIONS FOR SETTING THE DTC
The IPC determines that one or more of the following switches is active for more than 12.5 seconds:
^ FAN UP (PHONE)
^ FAN DOWN (RECALL)
^ TEMP UP (SEND)
^ TEMP DOWN (END)

DIAGNOSTIC AIDS
1. Inspect the steering wheel control keys for one of the following conditions:
^ Binding
^ Sticking
^ Broken
2. Each steering wheel control key (switch) has a unique counts value. Measure these counts with the following procedure:
2.1. Connect a scan tool.
2.2. Press each switch and view the steering wheel controls data list parameter.
2.3. Use the table for the correct value.
3. Each steering wheel control key (switch) has a unique resistance. Measure these resistance values with the following procedure:
3.1. Disconnect C202.
3.2. Connect a DMM to the steering column harness terminals Al and A4.
3.3. Press each key and measure the resistance.
3.4. Use the table for the correct value.