B1453

DTC B1453

Diagnostic Instructions

* Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. Initial Inspection and Diagnostic Overview
* Review Strategy Based Diagnosis for an overview of the diagnostic approach.
* Diagnostic Procedure Instructions provides an overview of each diagnostic category.

DTC Descriptors

DTC B1453 01
- Ignition 1 Voltage Circuit - Malfunction - High

DTC B1453 06
- Ignition 1 Voltage Circuit - Malfunction - Low

Diagnostic Fault Information






Circuit/System Description

The Ignition 1 Voltage signal connects the Serial Data Gateway Module (SDGM) along with numerous other modules to the vehicle 12-volt system through a fused relay in the under hood body electrical center (UBEC). This relay is closed by the Body Control Module (BCM) based on the key being in either the Run or Crank position.

Conditions for Running the DTC

Ignition voltage is between 9-16 volts.

DTC B1453 01

Ignition is in ACC position.

DTC B1453 06

Ignition is in RUN position.

Conditions for Setting the DTC

DTC B1453 01

Ignition 1 Voltage Circuit is more than 2.5 volts for more than 0.5 seconds.

DTC B1453 06

Ignition 1 Voltage Circuit is less than 2.5 volts for more than 0.5 seconds.

Action Taken When the DTC Sets

The SDGM will store the code in memory.

Conditions for Clearing the DTC

DTC B1453 01

Ignition 1 Voltage Circuit is less than 2.5 volts for more than 0.5 seconds.

DTC B1453 06

Ignition 1 Voltage Circuit is more than 2.5 volts for more than 0.5 seconds.

Diagnostic Aids

Many controllers such as the PIM, TCM, and SDM will set a DTC for a problem with the Ignition 1 Voltage circuit. Confirm that they do not have DTCs before only investigating the SDGM.

Circuit/System Testing

1. Ignition OFF, disconnect the SDGM harness connector X2 at the SDGM, verify that a test lamp does not illuminate between the ignition circuit terminal 20 and ground.

^ If the test lamp illuminates, test the signal circuit terminal 20 for a short to voltage.

2. Ignition ON, verify that a test lamp illuminates between the ignition circuit terminal 20 and ground.

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

3. If all circuits test normal, replace the SDGM.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure. Verification Tests