B1325
DTC B1325
Diagnostic Instructions
* Perform the Diagnostic System Check - Vehicle (Initial Inspection and Diagnostic Overview) prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis (Initial Inspection and Diagnostic Overview) for an overview of the diagnostic approach.
* Diagnostic Procedure Instructions (Initial Inspection and Diagnostic Overview) provides an overview of each diagnostic category.
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 - IPC
Diagnostic Fault Information
Circuit/System Description
The following control modules monitor the system voltage through the battery positive (B+) voltage circuits:
* Audio amplifier (AMP)
* Digital radio receiver (DDR)
* HVAC control module (HVAC)
* Instrument panel cluster (IPC)
* Navigation radio (NAV)
* Passenger presence system (PPS)
* Object alarm module (RPA)
* Hard Disk Drive (HDD) radio
* Remote Control Door Lock Receiver (RCDLR EK2)
* Rear Seat Audio (RSA)
* TV antenna module (TVM)
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 voltages supplied to the control modules are in the range of 7-26 V.
* The ignition is ON.
Conditions for Setting the DTC
B1325 03
The control module detects a system voltage less than 9 V for 5 seconds.
B1325 07
The control module detects a system voltage greater than 18 V for 5 seconds.
B1325 4A
The instrument panel cluster (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
* HVAC Schematics (Electrical Diagrams)
* Instrument Cluster Schematics (Instrument Cluster Schematics)
* Object Detection Schematics ([1][2]Collision Avoidance and Parking Assist Systems)
* Radio/Navigation System Schematics (Radio/Navigation System Schematics)
* Remote Function Schematics (Remote Function Schematics)
* SIR Schematics ([1][2]Air Bag Systems)
Connector End View Reference
Component Connector End Views (Connector Views)
Description and Operation
Charging System Description and Operation (Description and Operation)
Electrical Information Reference
* Circuit Testing (Component Tests and General Diagnostics)
* Connector Repairs (Component Tests and General Diagnostics)
* Testing for Intermittent Conditions and Poor Connections (Component Tests and General Diagnostics)
* Wiring Repairs (Component Tests and General Diagnostics)
Scan Tool Reference
Control Module References (Programming and Relearning) for scan tool information
Circuit/System Testing
1. Engine running, accessories OFF, measure and record the battery voltage at the battery terminals. The voltage should be between 12.6 and 15.0 V.
• If the battery voltage is not within the specified range, refer to Charging System Test (Charging System Test)
2. Ignition OFF, disconnect the harness connectors of the appropriate control module.
3. 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 8 X1 (AMP)
* Terminal 38 X1 (DDR)
* Terminal 38 X1 (HDD)
* Terminal 10 X1 (HVAC)
* Terminal 17 (IPC)
* Terminal 8 X1 (NAV)
* Terminal 7 X1 (RPA)
* Terminal D (PPS)
* Terminal S X1 (RCDLR EK2)
* Terminal 19 (TVM)
• If greater than the specified range, test the ground circuit for an open/high resistance.
4. Verify that a test lamp illuminates between the B+ circuit terminals listed below and ground.
* Terminal 4 X1 (AMP)
* Terminal 44 X1 (DDR)
* Terminal 44 X1 (HDD
* Terminal 18 X1 HVAC)
* Terminal 19 (IPC)
* Terminal 4 X1 (NAV)
* Terminal 1 X1 (RPA)
* Terminal A (PPS)
* Terminal H X1 (RCDLR EK2)
* Terminal 20 (TVM)
• If the test lamp does not illuminate, test the B+ circuit for a short to ground or an open/high resistance.
5. If the circuits test normal, replace the appropriate control module.
Repair Instructions
Perform the Diagnostic Repair Verification (Verification Tests) after completing the diagnostic procedure.
Control Module References (Programming and Relearning) for the appropriate control module replacement, setup, and programming