B1780

Diagnostic Chart:

CIRCUIT DESCRIPTION
Theft protection ON mode is active when a valid Vehicle Identification Number (VIN) has been stored in the radio and the last reported VIN matches. Any time the VIN is reported it is compared to the stored VIN.

CONDITIONS FOR SETTING THE DTC
^ DTC B1780 will set when a valid VIN stored in the radio and the last reported VIN does not match.
^ DTC B1780 will also set when a valid VIN stored in the radio and no VIN reported since battery power was restored to the radio.

ACTION TAKEN WHEN THE DTC SETS
^ Stores a DTC B1780 in the IRC memory.
^ The radio displays THEFTLOCK ACTIVE when the radio is turned On.
^ All radio functions are disabled.

CONDITIONS FOR CLEARING THE DTC
^ DTC B1780 will automatically clear when the IRC receives the correct production sequence number (the last six digits of the VIN) from the Body Control Module (BCM) over the Class 2 serial data line.
^ Using a scan tool.

TEST DESCRIPTION
The numbers below refer to the step numbers on the diagnostic table.
2. Clear all DTCs and cycle the ignition to check that the DTC did not falsely set.
7. Clear all DTCs after the repair procedure is complete.