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Home >> Chevrolet >> 2006 >> Cobalt LTZ >> Repair and Diagnosis >> External Pages >> Different car >> Section 687 (Wiring Systems And Power Management - DTC B1370 To DTC B2535) >> DTC B1370 >> Test Description

Test Description

WARNING: This page is about a different car, the 2007 Pontiac G5 Pursuit, 2007 Pontiac G5, and 2007 Chevrolet Cobalt. However, it is still accessible from the selected car via links, so may be relevant.

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

  1. 3:  This 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 tests the wiring of the ignition 1 circuit for a short to ground or voltage.
  3. 5:  This 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 Values Yes No
Schematic Reference: Body Control System Schematics and Power Distribution Schematics
Connector End View Reference: Master Electrical Component List
1 Did you perform the Diagnostic System Check - Vehicle? - Go to Step 2  Go to DIAGNOSTIC STARTING POINT - VEHICLE
2
  1. Install a scan tool.
  2. Turn ON the ignition, with the engine OFF.
  3. Check for DTCs B1370 and B1380 in the body control module (BCM).
Does the scan tool display DTC B1370 or DTC B1380 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 Circuit Testing .
Did you find a short between the 2 circuits?		 B+ 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 Circuit Testing .
Did you find and correct the condition?		 B+ 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 .
  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 and Start Switch Replacement .
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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