Chevrolet Trax: DTC B071F: Transmission shift indicator internal malfunction

Diagnostic Instructions

• Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure.
• Review Strategy Based Diagnosis for an overview of the diagnostic approach.
• Diagnostic Procedure Instructions provides an overview of each diagnostic category

DTC Descriptor

DTC B071F 39

Transmission Shift Indicator Internal Malfunction

Circuit/System Description

The transmission shift lever position indicator is located on the center console and indicates the current transmission shift level position. The transmission shift lever position indicator receives power and ground and is controlled by the body control module (BCM) via serial data.

Conditions for Running the DTC

The ignition is ON.

Conditions for Setting the DTC

The BCM has detected an internal malfunction in the transmission shift lever position indicator

Action Taken When the DTC Sets

No action is taken

Conditions for Clearing the DTC

The DTC will become history if the BCM no longer detects a malfunction

Reference Information

Schematic Reference

Instrument Cluster Schematics (Encore), Instrument Cluster Schematics (Trax)

Connector End View Reference

WIRING SYSTEMS AND POWER MANAGEMENT - COMPONENT CONNECTOR END VIEWS - INDEX - ENCORE WIRING SYSTEMS AND POWER MANAGEMENT - COMPONENT CONNECTOR END VIEWS - INDEX - TRAX

Description and Operation

Instrument Cluster Description and Operation

Electrical Information Reference

• Circuit Testing
• Connector Repairs
• Testing for Intermittent Conditions and Poor Connections
• Wiring Repairs

Scan Tool Reference

Control Module References for scan tool information

Circuit/System Verification

1. Ignition ON.
2. Verify DTC B071F 39 is not set.

• If the DTC is set

Replace the P2 Transmission Shift Lever Position Indicator.

• If the DTC is not set

3. All OK.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the repair.

Displays and Gauges Component Replacement Reference

DTC B1370: CONTROL MODULE IGNITION ON AND START CIRCUIT

Diagnostic Instructions

• Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure.
• Review Strategy Based Diagnosis for an overview of the diagnostic approach.
• Diagnostic Procedure Instructions provides an overview of each diagnostic category.

DTC Descriptors

DTC B1370 01

Control Module Ignition On and Start Circuit Short to Battery

DTC B1370 06

Control Module Ignition On and Start Circuit Open

Diagnostic Fault Information

Circuit/System Description

The vehicle power mode master is the body control module (BCM). The ignition switch is a low current switch with multiple discrete circuits to the BCM.

The power mode master will activate relays and other direct outputs of the power mode master as needed according to the calculated power mode. Some relays controlled by the BCM are switched ignition voltage outputs that are pass through circuits within the BCM directly from the ignition switch. If these circuits short to ground, the B+ circuit fuse to the ignition switch will open.

Conditions for Running the DTC

B1370 01

Ignition switch is in the Accessory position

B1370 06

Ignition switch is in the Accessory, Run, or Crank positions.

Conditions for Setting the DTC

B1370 01

Ignition circuit is shorted to voltage.

B1370 06

• Ignition circuit is open.
• Ignition or run/crank relay circuit is shorted to ground.
• B+ circuit of the ignition run/crank relay is open or shorted to ground.
• Ignition run/crank relay control circuit open, including relay coil and ground.

Action Taken When the DTC Sets

The Instrument Cluster still functions except check engine light is always off.

Conditions for Clearing the DTC

• The condition responsible for setting the DTC no longer exists.
• A history DTC will clear once 50 consecutive malfunction-free ignition cycles have occurred.

Reference Information

Schematic Reference

• Instrument Cluster Schematics (Encore), Instrument Cluster Schematics (Trax)
• Power Distribution Schematics (Encore) , Power Distribution Schematics (Trax)
• Power Moding Schematics (Encore) , Power Moding Schematics (Trax)

Connector End View Reference

WIRING SYSTEMS AND POWER MANAGEMENT - COMPONENT CONNECTOR END VIEWS - INDEX - ENCORE WIRING SYSTEMS AND POWER MANAGEMENT - COMPONENT CONNECTOR END VIEWS - INDEX - TRAX

Description and Operation

• Instrument Cluster Description and Operation
• Power Mode Description and Operation

Electrical Information Reference

• Circuit Testing
• Connector Repairs
• Testing for Intermittent Conditions and Poor Connections
• Wiring Repairs

Scan Tool Reference

Control Module References for scan tool information

Circuit/System Verification

1. Verify that DTC B144B or B1380 is not set.

• If DTC B144B or B1380 is set

Refer to Diagnostic Trouble Code (DTC) List - Vehicle .

• If DTC B144B or B1380 is not set

Refer to Circuit/System Testing.

Circuit/System Testing

1. Ignition OFF, disconnect the KR73 Ignition Main Relay.
2. Test for less than 10 ohms between the ground circuit terminal 1 and ground.

• If 10 ohms or greater

Test the ground circuit for an open/high resistance.

• If less than 10 ohms

3. Verify that a test lamp illuminates between the B+ circuit terminal 3 and ground.

• If the test lamp does not illuminate

Repair the open/high resistance in the circuit.

• If the test lamp illuminates

4. Verify that a test lamp does not illuminate between the control circuit terminal 2 and ground.

• If the test lamp illuminates

1. Disconnect the harness connector at the K9 Body Control Module.
2. Test for less than 1 V between the control circuit and ground.

• If 1 V or greater, repair the short to voltage on the circuit.
• If less than 1 V, replace the K9 Body Control Module.
• If the test lamp does not illuminate

5. Ignition ON, verify that a test lamp illuminates between the control circuit terminal 2 and ground.

• If the test lamp does not illuminate

1. Test for less than 2 ohms in the control circuit end to end.

• If less than 2 ohms, replace the K9 Body Control Module.
• If 2 ohms or greater, repair the open/high resistance in the circuit.
• If the test lamp illuminates

6. Ignition OFF, reconnect the KR73 Ignition Main Relay.
7. Disconnect the harness connector at the P16 Instrument Cluster.
8. Verify that a test lamp does not illuminate between the ignition circuit terminal 31 and ground.

• If the test lamp illuminates

1. Test for less than 1 V between the ignition circuit and ground.
2. If 1 V or greater, repair the short to voltage on the circuit.
3. If less than 1 V, replace the KR73 Ignition Main Relay.

If the test lamp does not illuminate

9. Ignition ON, verify that a test lamp illuminates between the ignition terminal 31 and ground.

If the test lamp does not illuminate and the Ignition fuse is good

1. Test for less than 2 ohms in the ignition circuit end to end

• If 2 ohms or greater, repair the open/high resistance in the circuit.
• If less than 2 ohms, replace the KR73 Ignition Main Relay.

If the test lamp does not illuminate and the Ignition fuse is open

1. Test for infinite resistance between the ignition circuit and ground.

• If less than infinite resistance, repair the short to ground on the circuit.
• If infinite resistance, replace the P16 instrument cluster.
• If the test lamp illuminates

10. Replace the P16 instrument cluster.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the repair.

• Instrument Cluster Replacement (Encore), Instrument Cluster Replacement (Trax)
• Relay Replacement (Within an Electrical Center) , Relay Replacement (Attached to Wire Harness)
• Control Module References for BCM replacement, programming and setup

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