GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Buick 🢒 2008 🢒 LaCrosse 🢒 DTC 🢒 DTC B1433

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 Descriptor

DTC B1433 00: Ignition-Switched Power Relay 2 Circuit

Circuit/System Description

The body control module (BCM) supplies B+ to terminal 5, X1. For vehicles equipped with a Run relay, the BCM controls the Run relay through the coil control circuit by applying voltage to the coil side of the relay. The Run relay is energized when any of the following conditions are true:

    • Ignition Switch is in ACCESSORY or RUN.
    • The vehicle is remote started.
    • The vehicle is in retained accessory power (RAP) mode.

Conditions for Running the DTC
    • The system voltage is between 9-16 V.
    • The DTC can only set when the output is actively being requested by the module.

Conditions for Setting the DTC

The DTC will set only when the module requests the output and there is a short to ground at BCM terminal 5, X1 or in the Run relay coil control circuit.

Action Taken When the DTC Sets

The module output driver will be shut down and not supply voltage to the circuit.

Conditions for Clearing the DTC
    • The current DTC will clear when the module request for the output is removed or the malfunction is no longer present.
    • A history DTC clears when the module ignition cycle counter reaches the reset threshold of 50, without a repeat of the malfunction.

Diagnostic Aids
    • DTC B1433 00 will not cause any symptoms.
    • Diagnose all other DTCs and symptoms first as this code may be set as a result of other concerns.
    • BCM replacement is not necessary for this DTC.

Reference Information

Schematic Reference

    •  Body Control System Schematics
    •  Power Distribution Schematics
    •  Power Moding Schematics

Connector End View Reference

Component Connector End Views

Description and Operation

Power Mode 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. Ignition OFF, disconnect the X1 harness connector at the BCM.
  2. Verify there are not any aftermarket components wired into terminal 5.
  3. If terminal 5 is empty, clear the code as there are not any further circuits to diagnose.