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HOMESERVICE MANUALSCHEVROLET2006COBALT SS, 4D SEDAN, STANDARDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 241 (COMPUTER/INTEGRATING SYSTEMS)DIAGNOSTIC INFORMATION AND PROCEDURESDTC B1370TEST DESCRIPTION
2006 Chevrolet Cobalt SS, 4D Sedan, Standard

Test Description

2006 Chevrolet Cobalt SS, 4D Sedan, StandardSECTION Test Description
WARNING: This page is about a different car, the 2006 Buick LaCrosse and 2006 Buick Allure. However, it is still accessible from the selected car via links, so may be relevant.

The numbers below refer to the indicated step numbers on the diagnostic table.

  1. 3:  This step tests the ignition switch for a short circuit between the 12-volt reference supply circuit and the ignition 1 circuit in the OFF position.
  2. 4:  This step tests the wiring of the ignition 1 circuit for a short to ground or voltage.
  3. 5:  This step tests the ignition switch for a closed circuit between the ignition switch 12-volt reference supply circuit and the ignition 1 circuit in the Run and Crank switch positions. Care must be taken as the engine may crank during this test.
DTC B1370

Step Action Yes No
Schematic Reference: Body Control System Schematics  and Power Distribution Schematics in Wiring Systems
Connector End View Reference: Computer/Integrating Systems Connector End Views  and Master Electrical Component List in Wiring Systems
1 Did you perform the Diagnostic System Check - Vehicle? Go to Step 2  Go to Diagnostic System Check - Vehicle in Vehicle DTC Information
2
  1. Install a scan tool.
  2. Turn ON the ignition, with the engine OFF.
  3. Check for DTCs in the range of DTC B1370-B1385 in the body control module (BCM).
Does the scan tool display DTC B1370 to DTC B1385 as current?		 Go to Step 3  Go to Diagnostic Aids
3 
  1. Disconnect the BCM harness connector that contains the ignition 1 circuit.
  2. Place the ignition switch in the OFF position, leaving the key in the ignition.
  3. Test for a short to ground and a short to voltage between the ignition 1 circuit and the ignition switch 12-volt reference supply circuit at the BCM harness connector. Refer to Body Control System Schematics  and Circuit Testing in Wiring Systems.
Did you find a short between the 2 circuits?		 Go to Step 4  Go to Step 5 
4 
  1. Disconnect the ignition switch harness connector.
  2. Test the ignition 1 ignition switch circuit and the ignition switch 12-volt reference supply circuit for a short to ground or voltage at the BCM harness connector. Refer to the following:
Did you find and correct the condition?		 Go to Step 9  Go to Step 7 
5 
IMPORTANT: The engine may crank during this procedure.
  1. Turn the ignition switch to the RUN position.
  2. Test for continuity between the ignition 1 terminal and the ignition switch 12-volt reference supply terminal on the BCM harness connector. Refer to Circuit Testing in Wiring Systems.
  3. Turn the ignition switch to CRANK.
  4. Test for continuity between the ignition 1 terminal and the ignition switch 12-volt reference supply terminal on the BCM harness connector.
Can you measure continuity in both Run and Crank?		 Go to Step 8  Go to Step 6 
6 Test the ignition 1 and the ignition switch 12-volt reference supply terminals of the ignition switch harness connector, for intermittent or poor connections and an open condition.
Did you find and correct the condition?		 Go to Step 9  Go to Step 7 
7 Replace the ignition switch. Refer to Ignition Switch Replacement in Steering Wheel and Column.
Did you complete the replacement?		 Go to Step 9  -
8 Replace the BCM. Refer to Control Module References  for replacement, setup and programming.
Did you complete the replacement?		 Go to Step 9  -
9
  1. Reconnect all disconnected connectors.
  2. Install the scan tool.
  3. Turn ON the ignition, with the engine OFF.
  4. Use the scan tool in order to clear the DTCs.
  5. Operate the vehicle within the Conditions for Running the DTCs, as specified in the supporting text.
Does the DTC reset?		 Go to Step 1  System OK
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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.