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2005 V50 T5 manual transmission reverse light switch problem

Help, Advice, Owners' Discussion and DIY Tutorials devoted to the second generation C70, S40 and V50 Volvos -- awkwardly model year 2004 ½ onwards -- plus where to go for advice and discussion on Volvo's sporty C30 Coupe powered by Volvo's ubiquitous inline 5-cylinder power plant.
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styang19
Posts: 3
Joined: 4 September 2018
Year and Model: 2005 V50
Location: California

2005 V50 T5 manual transmission reverse light switch problem

Post by styang19 »

The reverse light of my 2005 V50, T5 manual, is not working. I have checked all the fuses and light bulbs for the reverse light, they all work fine.
I am now suspecting the reverse light switch is broken. The problem I have is that I don’t know where the reverse light switch is at, and how to get to it to do the repair.
I would be appreciated if someone can help me on this.
I also heard that the original switch is no longer available, but I can get a new replacement kit for the switch.

Thanks,

-Steve

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RickHaleParker
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Post by RickHaleParker »

Did you check fuse 79 and relay 2/80?
Relay 2/80 is for the Reversing lights.
Relay 2/80 and F79 are under the passenger side of the dash.
⸙⸙⸙⸙⸙⸙⸙⸙⸙⸙⸙⸙⸙⸙⸙⸙⸙⸙⸙⸙⸙⸙⸙⸙⸙⸙⸙⸙⸙⸙⸙⸙⸙⸙⸙⸙⸙⸙⸙⸙⸙⸙⸙⸙⸙⸙⸙⸙⸙⸙⸙⸙⸙⸙⸙⸙⸙⸙⸙⸙⸙⸙⸙⸙⸙⸙⸙⸙⸙⸙⸙⸙⸙
1998 C70, B5234T3, 16T, AW50-42, Bosch Motronic 4.4, Special Edition package.
2003 S40, B4204T3, 14T twin scroll AW55-50/51SN, Siemens EMS 2000.
2004 S60R, B8444S TF80 AWD. Yamaha V8 conversion
2005 XC90 T6 Executive, B6294T, 4T65 AWD, Bosch Motronic 7.0.

styang19
Posts: 3
Joined: 4 September 2018
Year and Model: 2005 V50
Location: California

Post by styang19 »

Thank you Rick!
I have checked F79 on a module under the passenger side dash. It was okay.
I am having trouble in finding relay 2/80 on the same module. I found a description of the 2/80 relay at location R2 in the V50 wiring manual. I don’t know where location R2 is at. Is it supposed to be on the same module as F79? Or is it the R2 relay in the engine compartment fuse box?

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RickHaleParker
Posts: 7129
Joined: 25 May 2015
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Post by RickHaleParker »

2/80 is in relay position 2 (R2) of the same Fuse/relay box as F79. The relay positions should be marked.
⸙⸙⸙⸙⸙⸙⸙⸙⸙⸙⸙⸙⸙⸙⸙⸙⸙⸙⸙⸙⸙⸙⸙⸙⸙⸙⸙⸙⸙⸙⸙⸙⸙⸙⸙⸙⸙⸙⸙⸙⸙⸙⸙⸙⸙⸙⸙⸙⸙⸙⸙⸙⸙⸙⸙⸙⸙⸙⸙⸙⸙⸙⸙⸙⸙⸙⸙⸙⸙⸙⸙⸙⸙
1998 C70, B5234T3, 16T, AW50-42, Bosch Motronic 4.4, Special Edition package.
2003 S40, B4204T3, 14T twin scroll AW55-50/51SN, Siemens EMS 2000.
2004 S60R, B8444S TF80 AWD. Yamaha V8 conversion
2005 XC90 T6 Executive, B6294T, 4T65 AWD, Bosch Motronic 7.0.

styang19
Posts: 3
Joined: 4 September 2018
Year and Model: 2005 V50
Location: California

Post by styang19 »

Sorry for my ignorance, just to be sure my understanding is correct: Relay 2/80 is a “soldered-down” component on the CEM circuit board inside the “under-the-dash” fuse/relay box. This relay is not one of those relays that I can unplug-and-replace with my hand.

If it turns out that I have to replace the CEM, I have to copy all the vehicle specific data from my original CEM to my new CEM.

Is my understanding above correct?

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