S40 (New) Electrics : - Intermittent boot opening even after replacing wiring loom

StatusRed · Jan 9th, 2021, 17:46

Noticed my boot started not opening reliably last week, so having seen many an article about the boot not opening over the years I realised my S40 had probably finally succumed to the wiring loom becoming frayed.

Replaced it today but the boot seems to only open about 10% of the time, so I'm just wondering what I should be looking to change next? I've cleaned all the contacts in the handle switch as well as taking off the lock mechanism and greasing it as best I can. The numberplate lights work.. But then tried it again after a short car journey and the boot opened fine 5 times in a row :S

I didn't entirely waste my time though, as you can see from the pictures the loom was on the way out anyway.

=

Cheers.

PNM · Jan 9th, 2021, 18:39

Now you know the loom is good, the next most likely suspect is the switch. You could either test it using a multimeter assuming you can find a wiring diagram or take the plunge and get a replacement switch.

StatusRed · Jan 9th, 2021, 19:08

Quote:

Originally Posted by PNM

Now you know the loom is good, the next most likely suspect is the switch. You could either test it using a multimeter assuming you can find a wiring diagram or take the plunge and get a replacement switch.

This is what I'm thinking so, is it still likely to be the switch rather than the lock mechanism if the numberplate lights are working?

PNM · Jan 9th, 2021, 19:13

The power supply to the unit is good, because you've changed the loom and the lights work, but the switch bit might be failing to complete the circuit to release the lock mechanism.

StatusRed · Jan 9th, 2021, 21:20

Quote:

Originally Posted by PNM

The power supply to the unit is good, because you've changed the loom and the lights work, but the switch bit might be failing to complete the circuit to release the lock mechanism.

Yeah that might explain it being intermittent, I'll lookup price of the part.

PNM · Jan 10th, 2021, 08:09

I got one from caffyns online parts shop for about £20 earlier in the year.

StatusRed · Jan 10th, 2021, 09:55

Quote:

Originally Posted by PNM

I got one from caffyns online parts shop for about £20 earlier in the year.

Yeah seen their shop on eBay selling for under £30, I'll phone FRF on Monday and check their price. Probably the best option first, lock mechanisms seem more expensive.

StatusRed · Jan 14th, 2021, 13:19

Currently waiting for the micro switch to arrive from Caffyns. I'll update with results once it's been swapped out on the car.

StatusRed · Jan 15th, 2021, 18:23

Replaced the microswitch today and hey presto boot now works perfectly again

Thanks.

SavemyS40 · May 26th, 2021, 20:06

hey, did you have the boot lid open error message with this?? I changed my loom which had also had it, boot now opens everytime with the switch, but still displays error message "boot lid open" and hazards dont flash when i lock the car.........not sure what this could be?

Jan 9th, 2021, 17:46	#1
StatusRed Premier Member Last Online: Apr 24th, 2024 19:28 Join Date: Jul 2015 Location: Glasgow	Intermittent boot opening even after replacing wiring loom Noticed my boot started not opening reliably last week, so having seen many an article about the boot not opening over the years I realised my S40 had probably finally succumed to the wiring loom becoming frayed. Replaced it today but the boot seems to only open about 10% of the time, so I'm just wondering what I should be looking to change next? I've cleaned all the contacts in the handle switch as well as taking off the lock mechanism and greasing it as best I can. The numberplate lights work.. But then tried it again after a short car journey and the boot opened fine 5 times in a row :S I didn't entirely waste my time though, as you can see from the pictures the loom was on the way out anyway. = Cheers. __________________ 2009 S40 SE Lux 2.0i \| 2022 Suzuki V-Strom 650 \| 2002 Audi TT 225 Previous: C70 Coupe 2.4i \| Saab 9-5 Aero \| Daihatsu SporTrak

Jan 14th, 2021, 13:19	#8
StatusRed Premier Member Last Online: Apr 24th, 2024 19:28 Join Date: Jul 2015 Location: Glasgow	Currently waiting for the micro switch to arrive from Caffyns. I'll update with results once it's been swapped out on the car. __________________ 2009 S40 SE Lux 2.0i \| 2022 Suzuki V-Strom 650 \| 2002 Audi TT 225 Previous: C70 Coupe 2.4i \| Saab 9-5 Aero \| Daihatsu SporTrak

Jan 15th, 2021, 18:23	#9
StatusRed Premier Member Last Online: Apr 24th, 2024 19:28 Join Date: Jul 2015 Location: Glasgow	Replaced the microswitch today and hey presto boot now works perfectly again Thanks. __________________ 2009 S40 SE Lux 2.0i \| 2022 Suzuki V-Strom 650 \| 2002 Audi TT 225 Previous: C70 Coupe 2.4i \| Saab 9-5 Aero \| Daihatsu SporTrak

May 26th, 2021, 20:06	#10
SavemyS40 Junior Member Last Online: May 1st, 2023 10:43 Join Date: Apr 2021 Location: Devon	boot lid open hey, did you have the boot lid open error message with this?? I changed my loom which had also had it, boot now opens everytime with the switch, but still displays error message "boot lid open" and hazards dont flash when i lock the car.........not sure what this could be?

Jan 9th, 2021, 18:39	#2
PNM Member Last Online: Today 00:31 Join Date: Jun 2018 Location: Midlands	Now you know the loom is good, the next most likely suspect is the switch. You could either test it using a multimeter assuming you can find a wiring diagram or take the plunge and get a replacement switch.

Jan 9th, 2021, 19:13	#4
PNM Member Last Online: Today 00:31 Join Date: Jun 2018 Location: Midlands	The power supply to the unit is good, because you've changed the loom and the lights work, but the switch bit might be failing to complete the circuit to release the lock mechanism.

Jan 10th, 2021, 08:09	#6
PNM Member Last Online: Today 00:31 Join Date: Jun 2018 Location: Midlands	I got one from caffyns online parts shop for about £20 earlier in the year.

Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)