Categories: Auto Repair

BMW 525 F18 can not start and remote key unstuck

A BMW 525 F18 made 2015 N20 with 30 thousands kilometers,the owner described that remote fob can not open the doors,and only the left front door can be opened with mechanical key,power window switch can not lock and unlock the doors,instrument cluster doesn’t light on and can not start the engine.

2024.08 BMW Rheingold ISTA+ 4.48.40 4.23.14 ISTA-P 3.71 Free Download

 

 

Trouble Testing:

Our technicians test the BMW and found below troubles:

1. Remote key can not unlock the doors,and only opened by mechanical key.

2. Power window switch malfunction:can not lock and unlock.

3. Instrument cluster black screen,it displayed a “P” light when press the ignition button.

4. Can not start the engine even close the key to the steering column.

 

Trouble Diagnosis:

1. Perform the quick test:short circuit the pin #1 and pin #16 of OBD2 socket.And it found that vehicle can be identified,it mean the network gateway of vehicle work correctly.The vehicle network frame show as below:

2. Check the network diagram,found the communication faulire of K-CANS and MOST.

And when the MOST working,it is activated by K-CANS,so it is most likely that K-CAN2 trouble result system trouble.

 

Technicans use the multimeter to detect the circuit as below:

1. Connect the CAS adapter,detect the voltage of:

CAS

K-CAN2

K-CAN2-H

K-CAN2-L

The sum voltage is 4 v,but 5 v is normal.

 

2. Disconnect the vehicle battery,detect the resistance value between:

K-CAN2-H and K-CAN2-L,the resistance value is 20Ω,it means that there occur short circuit on K-CAN2,K-CAN2-H adn K-CAN2-L.

 

3. Disconnect the all modules on the K-CAN2-H-L circuit,then detect the resistance value was still 20 Ω.It suggested that the moduels is work correctly,the short circuit occured on the wire harness.

 

4. Found one of K-CAN connector is front of power box.Disconnect the connector,and disagnosed vehicle again and found the module behind JBE on K-CAN were failure to communicate.And technicians determind that the short circuit occur on the TBX and JBE.

5. Disassemb the TBX and JBE wire harness and found TBX wire harness was damaged and two wires are shorted together showed as below picture.

 

Separate the two wires and fix the wire harness.

Trouble symptom disappeared,the engine can started normally and power window swith work correctly,remote key function get right.

auto

Recent Posts

HITACHI Construction 4JJ1 P0092 Fuel Pressure Regulator Control Circuit High

Here car-auto-repair.com show you guide on how to solve ISUZU construction 4JJ1 engine P0092 fuel…

20 hours ago

How to Solve Perkins 1106D EPG Engine E398 Low Fuel Rail Pressure Error

Here is the illustration show you guide on how to solve Perkins 1106D electric power…

1 day ago

Deutz EMR3 Aassembly Inspection and Initialisation Test Guide

Here comes the instruction on how to use SerDia2010 to perform assembly inspection and initialization…

3 days ago

HITACHI ZX-5 Excavator No Load Max Differential Pressure Measurement Guide

This instruction show you guide on how to perform No load max differential pressure measurement…

4 days ago

How to Solve Doosan Machine P02EB Over Temperature Error

Here is the instruction show you guide on how to solve Doosan machine P02EB over…

5 days ago

How to Perform Relative Cylinder Compression Test for Detroit GHG17 Engine

This illustration show you how to use Detroit Diesel Diagnostic Link diagnostic software to do…

6 days ago