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HOMESERVICE MANUALSCHEVROLET2003TRAILBLAZER 4.2 S, 4WDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 946 (BODY CONTROL SYSTEM)DIAGNOSTIC INFORMATION AND PROCEDURESDTC B1422: DEVICE POWER MODING ERRORCONDITIONS FOR CLEARING THE DTC
2003 Chevrolet TrailBlazer 4.2 S, 4WD

Conditions for Clearing the DTC

2003 Chevrolet TrailBlazer 4.2 S, 4WDSECTION Conditions for Clearing the DTC
WARNING: This page is about a different car, the 2004 GMC Sierra, 2004 GMC Cab & Chassis Sierra, 2004 Chevrolet Silverado, and 2004 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.
  • A current DTC clears when the malfunction is no longer present.
  • A history DTC clears when the module ignition cycle counter reaches the reset threshold, without a repeat of the malfunction.
DTC B1422

Step Action Yes No
Schematic Reference:  Starting and Charging Schematics (Except HP2) Starting and Charging Schematics (HP2)  in Engine Electrical
Connector End View Reference:  Engine Electrical Connector End Views  in Engine Electrical
1 Perform the Diagnostic System Check for the system exhibiting the symptom. Refer to Control Module References .
Did you perform the Diagnostic System Check?		 Go to Step 2  Go to Control Module References 
2 Retrieve DTCs from body control module (BCM).
Did you record DTC B1440?		 Go to DTC B1440  Go to Step 3 
3
  1. Install a scan tool.
  2. Turn OFF the ignition.
  3. With a scan tool, monitor the following in HCM and BCM, Data Display:
    • Ignition 0
    • Ignition 1
Does the scan tool indicate that all inputs are Off?		 Go to Step 4  Go to Step 6 
4
  1. Install a scan tool.
  2. Turn the ignition switch to ACC.
  3. With a scan tool, monitor the following in HCM and BCM, Data Display:
    • Ignition 0
    • Ignition 1
Does the scan tool indicate that the Ignition 0 input is On?		 Go to Step 5  Go to Step 8 
5
  1. Turn the ignition switch ON, with the engine OFF.
  2. With a scan tool, monitor the following in HCM and BCM, Data Display:
    • Ignition 0
    • Ignition 1
Does the scan tool indicate that the both inputs are On?		 Go to Step 10  Go to Step 8 
6
  1. Disconnect the ignition switch harness connectors.
  2. With a scan tool, monitor the following in HCM and BCM, Data Display:
    • Ignition 0
    • Ignition 1
Does the scan tool indicate that any of the Ignition 0 or Ignition 1 inputs is On?		 Go to Step 7  Go to Step 9 
7
  1. Disconnect the HCM harness connectors.
  2. Test the suspect ignition switch input circuits for a short to voltage. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.
Did you find and correct the condition?		 Go to Step 14  Go to Step 11 
8
  1. Disconnect the ignition switch connectors.
  2. Install a 3A fused jumper between the suspect circuits and an ignition switch B+ supply.
  3. With a scan tool, monitor the suspect circuits in HCM and BCM, Data Display:
    • Ignition 0
    • Ignition 1
Does the scan tool indicate that the suspect circuit is now On?		 Go to Step 9  Go to Step 10 
9 Inspect for poor connections at the ignition switch harness connectors. Refer to Testing for Intermittent Conditions and Poor Connections andConnector Repairs in Wiring Systems.
Did you find and correct the condition?		 Go to Step 14  Go to Step 12 
10
IMPORTANT: If this step is performed following step 5, consider ignition 0 circuit of the HCM as suspected circuit.
  1. Disconnect the HCM harness connectors.
  2. Test the suspect ignition switch input circuits for a short to ground or an open. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.
Did you find and correct the condition?		 Go to Step 14  Go to Step 11 
11 Inspect for poor connections at the HCM harness connectors. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems.
Did you find and correct the condition?		 Go to Step 14  Go to Step 13 
12 Replace the ignition switch. Refer to Ignition Switch Replacement in Steering Wheel and Column.
Did you complete the replacement?		 Go to Step 14  -
13
IMPORTANT: Perform the programming or setup procedure for the module if required.
Replace the HCM. Refer to Hybrid Control Module (HCM) Replacement (5.3L Engine w/RPO HP2) in Engine Electrical.Did you complete the replacement?		 Go to Step 14  -
14
  1. Reconnect all components.
  2. Use the scan tool in order to clear DTCs.
  3. Operate the vehicle within the Conditions for Running the DTC as specified in the supporting text.
Does the DTC reset?		 Go to Step 3  System OK
RENDER: 1.0x

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.