GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Cadillac 🢒 2009 🢒 Escalade ESV 🢒 Driver Information and Entertainment 🢒 Cellular, Entertainment, and Navigation 🢒 DTC B1325

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

Short to Ground

Open/High Resistance

Short to Voltage

Signal Performance

B+

B1325 03

B1325 03

--

--

Ground

--

B1325 03

--

--

Circuit/System Description

The control modules on this vehicle monitor the voltage on the battery positive (B+) voltage circuits. The following modules on this vehicle will set DTC B1325 if high or low battery voltage is detected:

    • Audio amplifier
    • Instrument panel cluster (IPC)
    • Passenger presence system (PPS)
    • Radio
    • Rear object sensor control module

Conditions for Running the DTC
    • The ignition is ON.
    • The ignition switch has not been in the start position for 2 seconds.

Conditions for Setting the DTC

B1325 03

The control module detects that the battery voltage is less than 8.5 volts for 1.2 seconds.

B1325 07

The control module detects that the battery voltage is greater than 18 volts for 1.2 seconds.

Action Taken When the DTC Sets
    • The control module immediately disables all outputs, 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 battery voltage is greater than 9.5 volts for 1.2 seconds.

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

    •  Radio/Navigation System Schematics
    •  Instrument Cluster Schematics
    •  SIR Schematics
    •  Object Detection Schematics

Connector End View Reference

Component Connector End Views

Description and Operation

Charging System Description and Operation

Electrical Information Reference

    •  Circuit Testing
    •  Connector Repairs
    •  Testing for Intermittent Conditions and Poor Connections
    •  Wiring Repairs

Scan Tool Reference

Control Module References 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 volts.
    2. ⇒If not within the specified range, refer to Charging System Test.
  2. Ignition OFF, disconnect the harness connectors at the appropriate 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 appropriate ground circuit terminals listed below and ground.
    4. • Terminal 5 (PPS)
    • Terminal 13 (IPC)
    • Terminal 8 X1 (amplifier, radio)
    • Terminal 7 X2 (rear object)
    ⇒If greater than the specified range, test the ground circuit for an open/high resistance.
  4. Verify that a test lamp illuminates between the appropriate B+ circuit terminals listed below and ground.
    5. • Terminal 1 (IPC, PPS)
    • Terminal 1 X1 (radio)
    • Terminal 4 X1 (amplifier)
    • Terminal 1 X2 (rear object)
    ⇒If the test lamp does not illuminate, test the B+ circuit for a short to ground or an open/high resistance.
  5. If all circuits test normal, replace the appropriate module.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

Control Module References for the appropriate module replacement, setup, and programming.