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DTC B3101

DTC B3101

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 B3101 00

Keyless Entry Data Link Circuit

Diagnostic Fault Information

Circuit Short to Ground Open/High Resistance Short to Voltage Signal Performance
B+

B3101 00

B3101 00

-

-

Serial Data - Enable Line

B3101 00

B3101 00

B3101 00

B3101 00

Serial Data - Receive

B3101 00

B3101 00

B3101 00

B3101 00

Low Reference

-

B3101 00

-

-



Circuit/System Description

The body control module (BCM) communicates with the remote control door lock receiver through the keyless entry serial data circuits. When any button on the keyless entry transmitter is pressed, the transmitter sends a signal to the remote control door lock receiver. The remote control door lock receiver sends a function request to the BCM, depending on which button is pressed on the transmitter. The BCM receives the message and performs the appropriate function.

Conditions for Running the DTC

A button is pressed on the keyless entry transmitter.

Conditions for Setting the DTC

No response is received from the remote control door lock receiver after the BCM requests information from or sends configuration commands to the remote control door lock receiver.

Action Taken When the DTC Sets

In case of power failure the remote control door lock receiver is disabled for 65 seconds, otherwise no action is taken.

Conditions for Clearing the DTC


• A current DTC will clear when the fault is no longer present.

• A history DTC will clear after 40 consecutive ignition cycles without a fault present.


Reference Information

Schematic Reference

Remote Function Schematics

Component Connector End Views

Component Connector End Views

Description and Operation

Keyless Entry System Description and Operation (without ATH) Keyless Entry System Description and Operation (with ATH)

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 Testing


1. Ignition OFF, disconnect the harness connector at the K77 remote control door lock receiver.

2. Ignition OFF, doors closed, key out of the ignition switch, scan tool disconnected. It may take up to 2 minutes for all vehicle systems to power down. Test for less than 50 Ω between the low reference circuit terminal 1 and ground.

3. If greater than the specified range, test the low reference circuit for an open/high resistance. If the circuit tests normal, replace the K77 remote control door lock receiver.

4. Ignition ON, verify that a test lamp illuminates between the B+ circuit terminal 4 and ground.

5. If the test lamp does not illuminate, test the B+ circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the K9 BCM.

6. Ignition ON, test for less than 3 to above 5 V between the serial data circuit terminal 3 and ground after inserting key in ignition cylinder.

7. If greater than the specified range, test the serial data circuit for a short to voltage. If the circuit tests normal, replace the K9 BCM.

8. If less than the specified range, test the serial data circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the K9 BCM.

9. Disconnect the X1 and X2 harness connectors at the K9 BCM.

10. Test for less than 1 V between the serial data circuit terminal 27 and ground.

11. If greater than the specified range, test the serial data circuit for a short to voltage.

12. Ignition OFF, test for infinite resistance between the serial data circuit terminal 27 and ground.

13. If not the specified value, test the serial data circuit for a short to ground.

14. Test for less than 2 Ω between the K9 BCM terminal 27 X2 and K77 remote control door lock receiver terminal 2.

15. If greater than the specified range, test the serial data circuit for an open/high resistance.

16. If the circuits test normal, replace K77 Remote Control Door Lock Receiver. Check if the B3101 is no longer set as current.

17. After K77 remote control door lock receiver replacement, if B3101 is still current, replace the K9 BCM.


Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

Control Module References for BCM or remote control door lock receiver replacement, programming and setup