Weird locking/unlocking issues

[78F350]

The box under the left side seat is the 'central locking unit' The antenna wire for the remote may not be connected securely.
Check this post and the thread it was posted in. The round gold colored connector is where the antenna connects if you have a 3 button remote.

***Note: Do not put your key in the ignition with the seat removed. It can cause an airbag fault.***

Originally Posted by Qmulus

Well, I just so happen to have an M535 996.618.262.03 module right next to me. From what I have seen, the cars with three button remotes and the M535 module have the coax connection. The cars with two button remote and M531 module have the coax run through terminals the blue connector. Either way, you have the coax antenna in the harness, but on the M535 they split it out and put it through a proper RF connector. So, I would say that you have an M531 alarm/immobilizer module in your car.

A picture is worth a thousand words, so here you go.

[ripratama]

Originally Posted by 78F350

The box under the left side seat is the 'central locking unit' The antenna wire for the remote may not be connected securely.

Thanks; checked the coaxial plug and connection is intact. Problems still persist, however.

[thom4782]

Bit of a left field guess here, but when so many electrical problem occur at once perhaps its the ignition switch that's gone bad.

What codes did the dealer find?

[ripratama]

Originally Posted by thom4782

Bit of a left field guess here, but when so many electrical problem occur at once perhaps its the ignition switch that's gone bad.

What codes did the dealer find?

Dealer only gave me a quote of the parts with P/Ns but not the codes.

Further investigation and findings:

Upon re-checking the 535 module under the seat, the fuse was found defective and replaced with new one.

Everything then went back normal (hoorah!) for few seconds, then it blew again (boo!).

After wasting 3 new fuses which immediately blew upon insertion, I gave up. Could it be:
1. Pinched/split open wire?
2. Faulty actuator(s)?
3. Faulty 535 module?

Would appreciate anyone's advice to pin point the exact cause.

[geetee]

Originally Posted by thom4782

Bit of a left field guess here, but when so many electrical problem occur at once perhaps its the ignition switch that's gone bad.

What codes did the dealer find?

You'd be amazed at what this stupid little thing can do when there's an issue.
The ign switch is cheap with some hours of labor from you...and can cause similar issues you have and a new one can solve. As much as I hate throwing parts at an issue It's cheap to do...and do fail quite often

[tonycarreon]

Originally Posted by geetee

You'd be amazed at what this stupid little thing can do when there's an issue.

+upvote

"my left brake makes a weird noise when i turn right"
"check the ignition switch..."