Refer to
Cellular Telephone Module (w/UV8)
and
Cellular Telephone Microphone (w/UV8)
.
Circuit Description
The module monitors the voltage level available for system operation. If the voltage level is too high, damage may result in the system.
Conditions for Setting the DTC
The battery positive voltage (B+) is greater than 15.5 volts.
Action Taken When the DTC Sets
The module disables the loss of class 2 communication DTCs U1000 through U1301.
Conditions for Clearing the DTC
| • | The condition for the DTC is no longer present (the DTC is not current) and you used the scan tool Clear DTC function. |
| • | The condition for the DTC is no longer present (the DTC is not current) and you used the On-Board Diagnostics Clear DTC function. |
| • | The module automatically clears the history DTC when a current DTC is not detected in 50 consecutive drive cycles. |
Diagnostic Aids
A possible cause of this DTC is overcharging.
Test Description
The numbers below refer to the step numbers on the diagnostic table.
-
This step uses the scan tool to inspect the voltage to the body control module (PZM). A high voltage value in multiple modules indicates a concern in the charging system.
-
This step verifies that the condition is still present.
Step | Action | Value(s) | Yes | No |
|---|---|---|---|---|
1 | Did you perform Diagnostic System Check - Cellular Telephone ? | -- | Go to Step 2 | |
With the scan tool, observe the Battery Voltage parameter in the Body Control Module data list. Does the scan tool indicate the voltage is greater than the specified value? | 15.5 V | Go to Diagnostic System Check - Engine Electrical in Engine Electrical | Go to Step 3 | |
Does the DTC reset? | -- | Go to Step 4 | Go to Diagnostic Aids | |
4 | Replace the cellular telephone module. Refer to Radio Frequency Booster and Bracket Assembly Replacement . Did you complete the replacement? | -- | Go to Step 5 | -- |
5 |
Does the DTC reset? | -- | Go to Step 2 | System OK |
