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Home >> Pontiac >> 2006 >> Torrent FWD >> Repair and Diagnosis >> Accessories & Equipment >> Gauges & Instrument Panels >> Instrument Panel System Displays, Gauges And Console >> Diagnostic Information and Procedures >> DTC B0728, B0733, B0738, or B0748 >> Diagnostic Aids

Diagnostic Aids

An open or short to ground in the instrument panel (I/P) lamps dimmer switch signal can disable the PRNDL display. Check for DTC B2627 in Lighting Systems.

Refer to Circuit Testing and to Wiring Repairs in Wiring Systems.

DTC B0728, B0733, B0738, or B0748

Step Action Values Yes No
Schematic Reference: Body Control System Schematics and Automatic Transmission Controls Schematics
Connector End View Reference: Computer/Integrating Systems Connector End Views
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. Turn OFF the ignition.
  2. Disconnect the shift indicator.
  3. Turn ON the ignition, with the engine OFF.
  4. Measure the voltage from one of the following shift indicator signal circuits to a good ground:
    • DTC B0728: PRNDL A signal circuit
    • DTC B0733: PRNDL B signal circuit
    • DTC B0738: PRNDL C signal circuit
    • DTC B0748: PRNDL P signal circuit
Does the voltage measure within the specified range?		 9-17 Volts Go to Step 8  Go to Step 3 
3
  1. Install a scan tool.
  2. Connect a 3-ampere fused jumper between the appropriate shift indicator signal circuit and a good ground.
  3. With the scan tool observe the TR Sw. A/B/C/P parameter in the body control module (BCM) Switch Inputs data list.
Does the scan tool display LOW?		 - Go to Step 4  Go to Step 5 
4 Inspect for poor connections at the harness connector of the shift indicator. 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 9  Go to Step 7 
5 Inspect for poor connections at the harness connector of the BCM. 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 9  Go to Step 6 
6 Replace the BCM. Refer to Control Module References in Computer/Integrating Systems for replacement, setup, and programming.
Did you complete the replacement?		 - Go to Step 9  -
7 Replace the shift indicator. Refer to Shift Indicator Replacement in Automatic Transaxle - AF33-5.
Did you complete the replacement?		 - Go to Step 9  -
8 Repair the short to voltage in the suspect shift indicator signal circuit. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.
Did you complete the repair?		 - Go to Step 9  -
9
  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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