U0197

U0197 - LOST COMMUNICATION WITH HANDS FREE PHONE MODULE

U0197 - Lost Communication With Hands Free Phone Module:

WHEN MONITORED
- With the ignition on
- Battery voltage between 10 and 16 volts
- IOD fuse installed
- FCM is configured correctly

SET CONDITION
Bus messages not received from the HFM for approximately 2 to 5 seconds.

POSSIBLE CAUSES
- CAN B BUS circuits open or shorted
- DTCs related to battery voltage, ignition, or VIN messages
- FCM not configured correctly
- Hands free module power and ground
- Hands free module
- Module that set this DTC

Diagnostic Test

1. VERIFY DTC IS ACTIVE

NOTE: Ensure the IOD fuse is installed and battery voltage is between 10 and 16 volts before proceeding.

With the scan tool, read active DTCs.

Q: Is this DTC active?

YES: Go To 2
NO: Refer to the Stored Lost Communication test procedure.

2. CHECK FOR ANY OF THE FOLLOWING ACTIVE DTCS

With the scan tool, read active DTCs from all modules.

NOTE: Check for FCM configuration, CAN B or C hardware electrical, VIN Missing/Mismatch, battery or ignition related DTCs.

Q: Does the scan tool display any active DTCs to the conditions listed above?

YES: Diagnose and repair the DTC. Refer to the Index for a complete list of the symptoms.
NO: Go To 3

3. VERIFY THAT THE HFM IS ACTIVE ON THE BUS

Turn the ignition on.
With the scan tool, select Network View and select Advanced.
Verify that the HFM is active on the bus.

Q: Is the HFM active on the bus?

YES: Go To 4
NO: Refer to Manufacturer Code Charts / Communications for the No Response test procedure.

4. CHECK FOR ADDITIONAL COMMUNICATION RELATED DTCS

With the scan tool, select Network View and select Advanced.

Q: Is there more than one module with active DTCs "Logged Against" the HFM?

YES: Replace/update the Hands Free Module. Perform BODY VERIFICATION TEST - VER 1. Body Verification Test
NO: Replace/update the module that set this DTC. Perform the appropriate VERIFICATION TEST. Vehicle Theft Security Verification Tests