01 V70 XC Multiple Electrical Issues

[joo070772]

Hello

I am new here and need some advice/help.
Last night, drove the my wife's XC(01 181XXXXmiles) and suddenly the following issue brought up right after cranked.
Please review the following information and let me know what do I need. Thank you.

1. No audio & auto climate control lights(Audio & ACC is working good).
- 2-3month ago, buzzing noise is coming from ACC when open the door.
It is still in there, I will clean inside the ACC fan.
2. No front & rear fog lights.
3. No headlight, seems only the DRL is working even set it on "0" position. No DIM funtioning.
4. The cluster liht is working:Spped & Tachometer lights.
However, the following lights are very DIM (not bright).
Trip odometer.
Gear and driving mode indicator.
Ambient temperature indicator.
Text window.
5. No warning lights/text message on the cluster.
6. All other electical is funtional.

I am assuming to:

1. DIM switch bad.
2. The battery issue?

Anyone can help? Thank you.

Regards

Joel J Benedict Lee

01 V70 XC 181XXX.
04 S60 141XXXmiles.

[oragex]

Perhaps the alternator relay or pulley are failing.

[joo070772]

Hello Oragex,

Thank you much quick reply. I will go ahead check the ALT. relay/pulley tonigh and will be updated.

Regards,

Joel J Benedict Lee

[precopster]

Sounds like a CEM (central electronic module) issue as this central computer controls the bus functions of many other systems in the car.

I would suggest first fully disconnecting the battery then reconnecting the battery terminals after 5 minutes with ignition key in PosII (before starting position)

Sometimes these modules have a glitch that causes all sorts of havoc with other systems in the car. Also if you have access to a test meter there is a test for AC current from the regulator. This can also cause gremlins to surface.

[joo070772]

Hello All,

Thank you for advise. After a short diagnose, found it the problem.

1. Alternator relay or pulley: Tested & normal.
2. CEM: Tested & normal.
3. ACC units: Tested & normal, however, need to clean the inside fan soon due to buz noise.
4. All fuses & relays: OK.

Root cause:

1. DIM switch: Tested & mafuntion.
Should repalced a new either good used unit.

Thank you much for help All.

Regards

Joel J Benedict Lee

[oragex]

Good news it was that easy. The DIM switch is it the one that is dimming the dash lights?

[joo070772]

Hello All,

Sorry for late response.
Yes, it is dimming the dash lights: headlights & front and rear fog lights switch.

Update:

Recv'd the part($49 from ebay) & tested. Well functioning.
All clear!

Regard

Joel J Benedict Lee