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 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 body control module, depending on which button is pressed on the transmitter. The body control module 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 body control module 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 Fuel Pump and Level Sensor Assembly
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 Control Module References for scan tool information
Circuit/System Testing
1. Ignition 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 ohms between the low reference circuit terminal 1 and ground.
• If 30 ohms or greater
1. Ignition OFF, disconnect the harness connector at the K9 body control module.
2. Test for less than 2 ohms in the low reference circuit end to end.
• If 2 ohms or greater, repair the open/high resistance in the circuit.
• If less than 2 ohms, replace the K9 body control module.
• If less than 30 ohms
3. Ignition ON.
4. Test for greater than 11.5 V between the B+ circuit terminal 4 and ground.
• If 11.5 V or less
1. Ignition OFF, disconnect the harness connector at the K9 body control module.
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 ohms in the B+ circuit end to end.
• If 2 ohms or greater, repair the open/high resistance in the circuit.
• If less than 2 ohms, replace the K9 body control module.
• 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. Ignition OFF, disconnect the harness connector at the K9 body control module.
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 ohms in the serial data circuit end to end.
• If 2 ohms or greater, repair the open/high resistance in the circuit.
• If less than 2 ohms, replace the K9 body control module.
• If greater than 6 V
1. Ignition OFF, disconnect the harness connector at the K9 body control module, ignition ON.
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 K9 body control module.
• If between 3-6 V
6. Ignition OFF, disconnect the X1 and X2 harness connectors at the K9 body control module, ignition ON.
7. Test for less than 1 V between the K9 body control module 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. Ignition OFF.
9. Test for infinite resistance between the K9 body control module 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 ohms between the K9 body control module serial data circuit terminal 27 X2 and the K77 remote control door lock receiver serial data circuit terminal 2.
• If 2 ohms or greater
Repair the open/high resistance in the circuit.
• If less than 2 ohms
11. Replace the K77 remote control door lock receiver.
12. Verify DTC B3101 does not set while operating the vehicle under the conditions for running the DTC.
• If the DTC sets
Replace the K9 body control module
• If the DTC does not set
13. All OK.
Repair Instructions
Perform the Diagnostic Repair Verification Verification Tests after completing the repair.
Control Module References Control Module References for body control module or remote control door lock receiver replacement, programming and setup