Volt

DTC B3101

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.

A button is pressed on the keyless entry transmitter.

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.

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

Schematic Reference

Remote Function Schematics

Component Connector End Views

Component Connector End Views

Description and Operation

Keyless Entry System Description and Operation

Electrical Information Reference

Scan Tool Reference

Control Module References for scan tool information

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 Ω between the low reference circuit terminal 1 and ground.

⇒	If 30 Ω or greater

2.1.	Vehicle OFF, disconnect the harness connector at the BCM.

2.2.	Test for less than 2 Ω in the low reference circuit end to end.

⇒	If 2 Ω or greater, repair the open/high resistance in the circuit.

⇒	If less than 2 Ω, replace the BCM.

⇓	If less than 30 Ω

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

4.1.	Vehicle OFF, disconnect the harness connector at the BCM.

4.2.	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.

4.3.	Test for less than 2 Ω in the B+ circuit end to end.

⇒	If 2 Ω or greater, repair the open/high resistance in the circuit.

⇒	If less than 2 Ω, 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

5.1.	Vehicle OFF, disconnect the harness connector at the BCM.

5.2.	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

5.3.	Test for less than 2 Ω in the serial data circuit end to end.

⇒	If 2 Ω or greater, repair the open/high resistance in the circuit.

⇒	If less than 2 Ω, replace the BCM.

⇒	If greater than 6 V

5.1.	Vehicle OFF, disconnect the harness connector at the BCM, Vehicle in Service Mode.

5.2.	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 Ω 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 Ω or greater

Repair the open/high resistance in the circuit.

⇓	If less than 2 Ω

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.

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