For 1990-2009 cars only
Circuit Description
At the beginning of the ignition cycle, the cellular telephone module performs a test in order to determine if the EEPROM is corrupted. The module performs the test by adding the checksum of the EEPROM block and that block's twos complement.
Conditions for Setting the DTC
The value of the addition does not equal zero.
Action Taken When the DTC Sets
The cellular telephone module performs the following functions:
| • | Clears all of the DTCs |
| • | Logs DTC B1658 as current |
| • | Defaults to the following values: |
| - | Personalization--Factory default |
| - | Ignition Cycle Counter--0 |
| - | Theft Alarm Condition--Cleared |
Diagnostic Aids
If DTC B1658 is set, perform the following steps:
- Clear the DTCs.
- Cycle the ignition.
If DTC B1658 is still current, replace the cellular telephone module. Refer to Cellular Telephone Module Replacement.
