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Old 12-08-19, 10:16 PM   #1
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Default 307 CC roof ECU all roof switch inputs open

2004 307 CC: I have a lot of fault codes in the roof ECU when checking why the roof is neither opening or closing on request. On closer check with PP2000 I can see that all microswitch inputs are detected by the ECU as open (this is when the roof is manually fully closed and locked). I have checked all microswitch at the ECU contact with ohm meeter and those that should are closed (to pin 19 on the 26pin connector) as they should.

So my thinking is that the ECU is partly faulty (it does respond to diagnose and also PP2000 can see that it receives the roof control input switch correctly).

But, reading all other threads seldom the ECU is broken. So perhaps it could be some strange grounding problem. Any ideas or suggestions what to check before I order a new ECU?
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Old 13-08-19, 07:01 AM   #2
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Confirm BSI fuses F4, F11 and F15 are ok, and power is reaching ECU pins 1, 4, 11 and 14.

Check for a good earth at ECU pins 8, 15 and 26.

Last edited by IanML; 13-08-19 at 07:09 AM.
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Old 24-08-19, 06:41 PM   #3
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Grounds and power inputs was tested OK. Ordered a replacement ECU and this fixed the problem
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