B1325

DTC B1325

Diagnostic Instructions

* Perform the Diagnostic System Check - Vehicle (Diagnostic System Check - Vehicle) prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis (Strategy Based Diagnosis) for an overview of the diagnostic approach.
* Diagnostic Procedure Instructions (Diagnostic Procedure Instructions) 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

Diagnostic Fault Information





Circuit/System Description

The following control modules monitor the system voltage through the battery positive (B+) voltage circuits:

* Headlamp control module
* Seat heating control module
* Head up display module
* Instrument cluster
* Passenger presence detection module
* Inflatable restraint sensing and diagnostic module
* Seat memory control module
* Multimedia player interface module
* Keyless entry control module
* Radio
* Parking assist control module

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.

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

Control Module References (Programming and Relearning)
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 (Circuit Testing)
* Connector Repairs (Connector Repairs)
* Testing for Intermittent Conditions and Poor Connections (Testing For Intermittent Conditions and Poor Connections)
* Wiring Repairs (Wiring Repairs)

Scan Tool Reference

Control Module References (Programming and Relearning) for scan tool information

Circuit/System Verification

1. Engine running, accessories OFF, measure and record the battery voltage at the C1 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. Engine running, observe the appropriate module scan tool Battery Voltage parameters. Verify that the scan tool displays a value that is within 2 V of the battery terminal voltage.

Circuit/System Testing

1. Ignition OFF, disconnect the harness connectors of the appropriate control module.
2. 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 circuit terminals listed below and ground:

* Terminal 6, K26 Headlamp control module
* Terminal A X1, K29 Seat heating control module
* Terminal 6, K78 Head-up display module
* Terminal 10, P16 Instrument cluster
* Terminal 19, K36 Inflatable restraint sensing and diagnostic module
* Terminal D, K85 Passenger presence detection module
* Terminal 3 X4, K40 Seat memory control module
* Terminal 6 X4, K40 Seat memory control module
* Terminal 11 X1, T11 Multimedia player interface module
* Terminal 2 X2, K84 Keyless entry control module
* Terminal 6 X2, K84 Keyless entry control module
* Terminal 38 X1, A11 Radio
* Terminal 7 X1, K41 Parking assist control module
* Terminal 8 X1, K41 Parking assist control module

• If greater than the specified range, test the ground circuit for an open/high resistance.

3. Verify that a test lamp illuminates between the B+ circuit terminals listed below and ground:

* Terminal 9, K26 Headlmap control module
* Terminal B X1, K29 Seat heating control module
* Terminal 4, K78 Head-up display module
* Terminal 19, P16 Instrument cluster
* Terminal 20, P16 Instrument cluster
* Terminal 9 X1, K36 Inflatable restraint sensing and diagnostic module
* Terminal 17 X1, K36 Inflatable restraint sensing and diagnostic module
* Terminal A, K85 Passenger presence detection module
* Terminal 1 X4, K40 Seat memory control module
* Terminal 5 X4, K40 Seat memory control module
* Terminal 1 X1, T11 Multimedia player interface module
* terminal 1 X2, T11 Multimedia player interface module
* Terminal 1 X2, K84 Keyless entry control module
* Terminal 5 X2, K84 Keyless entry control module
* Terminal 44 X1, A11 Radio
* Terminal 1 X1, K41 Parking Assist control module

• If the test lamp does not illuminate, test the B+ circuit for a short to ground or an open/high resistance.

4. 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