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Home >> GMC >> 2004 >> Jimmy 2D Utility, Part Time, Automatic >> Repair and Diagnosis >> Electrical >> Charging Systems >> Battery, Charging System And Starting System >> Diagnostic Information and Procedures >> DTC B1327: Device Power Circuit Low >> Test Description

Test Description

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

  1. 3:  Tests for the proper voltage at battery positive voltage sense circuit of the module, if voltage is not within the proper operating range, the voltage sense circuit needs to be tested.
  2. 4:  Tests the circuit for high resistance.
  3. 5:  Tests for the proper ground circuit for the module.
DTC B1327

Step Action Value(s) Yes No
Schematic Reference: Starting and Charging Schematics  or Power Distribution Schematics in Wiring Systems
Connector End View Reference: Master Electrical Component List in Wiring Systems
1 Did you perform the Engine Electrical Diagnostic System Check? - Go to Step 2  Go to Diagnostic System Check - Engine Electrical 
2
  1. Install a scan tool.
  2. Turn ON the ignition, with the engine OFF.
  3. With a scan tool, observe the battery voltage parameter in the affected module data list. Or with a DMM, measure the battery voltage at the appropriate circuit of the module.
Does the voltage measure greater than the specified value?		 9.4 V Go to Step 6  Go to Step 3 
3 
  1. Turn OFF the ignition.
  2. Disconnect the harness connector of the module setting the DTC B1327.
  3. Measure the voltage between the battery positive voltage circuit of the module setting the DTC B1327 and the ground circuit of the module setting the DTC B1327.
Does the voltage measure greater than the specified value?		 9.4 V Go to Step 6  Go to Step 4 
4 Test the batter positive voltage circuit of the module setting the code for a high resistance or an open. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.
Did you find and correct the condition?		 - Go to Step 8  Go to Step 5 
5 Test the ground sense circuit of the module setting the code for a high resistance or an open. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.
Did you find and correct the condition?		 - Go to Step 8  Go to Step 6 
6 Inspect for poor connections at the harness connector of the module setting the DTC. 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 8  Go to Step 7 
7
IMPORTANT: Perform the setup procedure for the module setting the code, if necessary.
Replace the module setting the DTC. Refer to Control Module References in Body Control System.Did you complete the replacement?		 - Go to Step 8  -
8
  1. Use the scan tool in order to clear the DTCs.
  2. Operate the vehicle within the Conditions for Running the DTC as specified in the supporting text.
Does the DTC reset?		 - Go to Step 2  System OK
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