Diagnostic Instructions
DTC Descriptors
DTC B1325 03: Device Power Circuit Voltage Below Threshold
DTC B1325 07: Device Power Circuit Voltage Above Threshold
DTC B1325 4A: Device Power Circuit Checksum Error - HUD/IPC
Diagnostic Fault Information
Circuit
| Short to Ground
| Open/High Resistance
| Short to Voltage
| Signal Performance
|
B+
| B1325 03, B1325 4A
| B1325 03, B1325 4A
| --
| --
|
Ground
| --
| B1325 03, B1325 4A
| --
| --
|
Circuit/System Description
The following control modules monitor the battery voltage through the battery positive (B+) voltage circuits:
| • | Instrument panel cluster (IPC) |
| • | Passenger presence system (PPS) |
| • | Ultrasonic parking aid (UPA) |
If any of the control modules listed detect that the battery voltage is out of range, it will set DTC B1325.
Conditions for Running the DTC
| • | The battery voltage supplied to the control module is in the range of 7-26 volts. |
Conditions for Setting the DTC
B1325 03
The control module detects that the system voltage is less than 9 volts for 5 seconds.
B1325 07
The control module detects that the system voltage is greater than 18 volts for 5 seconds.
B1325 4A
The HUD or IPC failed the power on checksum test, either due to low voltage or corrupted memory.
Action Taken When the DTC Sets
| • | The control module immediately disables all outputs when an out of range voltage condition has been detected, with the exception of serial data, which is disabled after a 3 minute delay. |
| • | The setting of other DTCs is inhibited. |
Conditions for Clearing the DTC
The DTC passes when the malfunction is no longer present.
Diagnostic Aids
| • | A high or low voltage value in multiple modules indicates a concern in the charging system. |
| • | Overcharging with a battery charger or jump starting can cause this DTC to set. |
Reference Information
Schematic Reference
Connector End View Reference
Component Connector End Views
Description and Operation
Charging System Description and Operation
Electrical Information Reference
Scan Tool Reference
Control Module References
for scan tool information
Circuit/System Testing
- Engine running, accessories OFF, measure and record the battery voltage at the battery terminals. The voltage should be between 12.6 and 15.0 volts.
- Ignition OFF, disconnect the harness connectors at the appropriate module.
- Ignition OFF and scan tool disconnected, open and close the driver door, and wait 1 minute. Test for less than 5 ohms between the ground circuits listed below and ground.
| • | Terminal 5 X1 (Radio UQG) |
| • | Terminal 8 X1 (Radio U42/UQF/UQA/UQS) |
| ⇒ | If greater than the specified range, test the ground circuit for an open/high resistance. |
- Verify that a test lamp illuminates between the B+ circuit terminals listed below and ground.
| • | Terminal 1 X1 (UPA, Radio U42/UQF/UQG) |
| • | Terminal 4 X1 (Radio UQA/UQS) |
| ⇒ | If the test lamp does not illuminate, test the B+ circuit for a short to ground or an open/high resistance. |
- If all circuits test normal, replace the appropriate control module.
Repair Instructions
Perform the
Diagnostic Repair Verification
after completing the diagnostic procedure.
Control Module References
for the appropriate module replacement, setup, and programming.
