B3101

DTC B3101

Diagnostic Instructions

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

DTC Descriptor
DTC B3101 00
- Keyless Entry Data Link Circuit

Diagnostic Fault Information






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 the case of power loss, 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 [1][2]Electrical Diagrams
Component Connector End Views

Component Connector End Views Hybrid/EV Battery Pack X1
Description and Operation

Keyless Entry System Description and Operation Description and Operation
Electrical Information Reference

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

Scan Tool Reference

Control Module References Programming and Relearning for scan tool information

Circuit/System Testing

1. Vehicle OFF and all vehicle systems OFF, disconnect the harness connector at the K77 remote control door lock receiver. It may take up to 2 minutes for all vehicle systems to power down.
2. Test for less than 30 ohm between the low reference circuit terminal 1 and ground.

• If 30 ohm or greater

1. Vehicle OFF, disconnect the harness connector at the BCM.
2. Test for less than 2 ohm in the low reference circuit end to end.

• If 2 ohm or greater, repair the open/high resistance in the circuit.
• If less than 2 ohm, replace the BCM.

• If less than 30 ohm

3. Vehicle in Service Mode.
4. Test for greater than 11.5 V between the B+ circuit terminal 4 and ground.

• If 11.5 V or less

1. Vehicle OFF, disconnect the harness connector at the BCM.
2. Test for infinite resistance between the B+ circuit and ground.

• If less than infinite resistance, repair the short to ground on the circuit.

• If Infinite resistance.

3. Test for less than 2 ohm in the B+ circuit end to end.

• If 2 ohm or greater, repair the open/high resistance in the circuit.
• If less than 2 ohm, replace the BCM.

• If greater than 11.5 V

5. Test for 3-6 V between the serial data circuit terminal 3 and ground.

• If less than 3 V

1. Vehicle OFF, disconnect the harness connector at the BCM.
2. Test for infinite resistance between the serial data circuit and ground.

• If less than infinite resistance, repair the short to ground on the circuit.

• If infinite resistance

3. Test for less than 2 ohm in the serial data circuit end to end.

• If 2 ohm or greater, repair the open/high resistance in the circuit.
• If less than 2 ohm, replace the BCM.

• If greater than 6 V

1. Vehicle OFF, disconnect the harness connector at the BCM, Vehicle in Service Mode.
2. Test for less than 1 V between the serial data circuit and ground.

• If 1 V or greater, repair the short to voltage on the circuit.
• If less than 1 V, replace the BCM.

• If within than 3-6 V

6. Vehicle OFF, disconnect the X1 and X2 harness connectors at the K9 BCM, Vehicle in Service Mode.
7. Test for less than 1 V between the K9 BCM serial data circuit terminal 27 X2 and ground.

• If 1 V or greater
Repair the short to voltage on the circuit.

• If less than 1 V

8. Vehicle OFF.
9. Test for infinite resistance between the K9 BCM serial data circuit terminal 27 X2 and ground.

• If less than infinite resistance
Repair the short to ground on the circuit.

• If infinite resistance

10. Test for less than 2 ohm between the K9 BCM serial data circuit terminal 27 X2 and the K77 remote control door lock receiver serial data circuit terminal 2.

• If 2 ohm or greater
Repair the open/high resistance in the circuit.

• If less than 2 ohm

11. Replace the K77 remote control door lock receiver.
12. Verify DTC B3101 is not set as current.

• If DTC B3101 is set as current
Replace the K9 BCM

• If DTC B3101 is not set or is set as history

13. All OK.

Repair Instructions

Perform the Diagnostic Repair Verification Verification Tests after completing the diagnostic procedure.

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