It is a repair case on repair Audi A8L J518 module,the vehicle keyless function can not work,and can not start the engine.For Audi repair,please check more cases here:Audi Trouble Repair Projects.
Use ODIS diagnostic to get trouble code,it show below fault code:
00183 – Interior Access/Start Authorization Antenna 1 (R138).
Preparation:
Newest ODIS-E Engineering 17.0.1/12.2.0/9.0.1 Free Download
08.2023 VW ODIS 23.0.5 & 7.2.1 & 5.2.7 Diagnostic Software Free Download
Diagnostics:
Measure the antenna resistance value is 11Ω and the connection between J518 to antenna work well.So it maybe the J518 module get trouble.
R13 R139 and R154 are parallel in the control unit,mechanic disconnect it and measure the resistance value of R154 IS 2Ω,it mean the trouble maybe in the diagram or R154.After checking the wire,mechanic found the wire under the armrest box was damaged,after fixing trouble symptom disappeared.
Without keylessGO function:
WIth KeylessGo Function
Replace triode and driver chip
This instruction show you guide on how to do deactivation test for MANITOU MT6034 telehandlers…
This instruction show you guide on how to solve Liebherr machine ECU2 P1119-00 trouble code…
This instruction show you guide on how to solve Bobcat machine trouble code P18A5 suction…
The measured intake manifold pressure (signal from boost pressure sensor) is below the warning limit…
JCB 3CX 4CX Backhoe Loader engine throttle cable is routed from the L.H. side of the…
Here is the instruction show you guide on how to replace fuel tank breather filter…