Windows don't dip, Alarm chirps twice and randomly alarms when locked

[jluetjen]

Problem statement. My windows don't dip when I unlock the convertable roof. I've already replaced the micro-switch, and the roof control unit in the footwell after this unit burnt out.
The windows also don't dip when the roof is down and I raise the roof. Finally, the alarm acts erratically -- it chirps twice when I lock (it locks), but then if often starts to alarm for no reason. The windows do go up though when I latch the roof after raising it.

Background:
I had the alarm, keys and ECU reprogrammed a couple of years ago, and had no issues.

The roof stopped working last year, which I fixed, ultimately replacing the microswitch in addition to the other parts shown in the thread -- although this issue described above has lingered.

Current fault codes: Alarm I48
- 34: Status: Not present. Passenger compartment monitoring sensor, short to ground. Occurrence counter 1
- 33: Status: Not present. W line (DME - immobilizer), open circuit. Occurrence counter 74
- 25: Status lead, signal converter, short circuit to B+. Occurrence counter 127

Alarm I32
- 34: Status: Not present. Interior sensor faulty, Not present. Occurrence counter 1
- 33: Status: Not present. Interior sensor faulty, Not present. Occurrence counter 74
- 25: W lead, status - present. Occurrence counter 127

I just pulled out the panel where the roof latches, and confirmed that all 3 connectors were firmly seated.
Any thoughts or suggestions?

-John

[Triops]

Originally Posted by jluetjen

Problem statement. My windows don't dip when I unlock the convertable roof. I've already replaced the micro-switch, and the roof control unit in the footwell after this unit burnt out.
The windows also don't dip when the roof is down and I raise the roof. Finally, the alarm acts erratically -- it chirps twice when I lock (it locks), but then if often starts to alarm for no reason. The windows do go up though when I latch the roof after raising it.

Background:
I had the alarm, keys and ECU reprogrammed a couple of years ago, and had no issues.

The roof stopped working last year, which I fixed, ultimately replacing the microswitch in addition to the other parts shown in the thread -- although this issue described above has lingered.

Current fault codes: Alarm I48
- 34: Status: Not present. Passenger compartment monitoring sensor, short to ground. Occurrence counter 1
- 33: Status: Not present. W line (DME - immobilizer), open circuit. Occurrence counter 74
- 25: Status lead, signal converter, short circuit to B+. Occurrence counter 127

Alarm I32
- 34: Status: Not present. Interior sensor faulty, Not present. Occurrence counter 1
- 33: Status: Not present. Interior sensor faulty, Not present. Occurrence counter 74
- 25: W lead, status - present. Occurrence counter 127

I just pulled out the panel where the roof latches, and confirmed that all 3 connectors were firmly seated.
Any thoughts or suggestions?

-John

My alarms/siren kept going off randomly so I disconnected the wires to both of them. Located under the front bonnet. My alarms not connected to an immobiliser. Check the code on the ECU under the seat you can read the label using a torch. Mine was M534 UK spec. Basically the random siren noise and chirping has gone. Clearly though the sensor failure causing the problem remains, however it has somewhat reduced my stress levels. Hope that helps