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 2 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 one of the following procedures:
