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Car Forum / Volvo Cars / November 200590 740 Dash board light problem
The display lights on my 90 740 went out the other night. The lights for the clock, speedometer, tach etc and the lights for the heater controls, ash tray and shift control are dark.. I changed the fuse but that fuse #21 also is for the marker lights and some back lights and they are all on. Any help appreciated. Thanks You need to check the connectors and wiring behind the dashboard. Fuse 5 supplies interior lights so will not be involved. The panel lights wiring involves a couple of inline soldered joints in the loom behind the dashboard (found by removing the knee panel or the instrument panel, then following the wires from behind one of the switches). I think they are Blue and Black. All the best, Peter. 700/900/90 Register Keeper, Volvo Owners Club (UK). > The display lights on my 90 740 went out the other night. The lights for > the [quoted text clipped - 4 lines] > help > appreciated. Thanks > The display lights on my 90 740 went out the other night. The lights for the > clock, speedometer, tach etc and the lights for the heater controls, ash > tray and shift control are dark.. I changed the fuse but that fuse #21 also > is for the marker lights and some back lights and they are all on. Any help > appreciated. Thanks Try wiggling the shaft of the dimmer rheostat and see if the lights come on. This model doesn't have a dimmer rheostat. > > The display lights on my 90 740 went out the other night. The lights for the > > clock, speedometer, tach etc and the lights for the heater controls, ash [quoted text clipped - 3 lines] > > Try wiggling the shaft of the dimmer rheostat and see if the lights come on. > This model doesn't have a dimmer rheostat. Are you sure? My '87 does, granted the '90 has a different dash but it would shock me if it didn't have a dimmer. >> This model doesn't have a dimmer rheostat. > > Are you sure? My '87 does, granted the '90 has a different dash but it > would shock me if it didn't have a dimmer. Sadly, "PK" is mistaken. The instrument panel rheostat is shown below, http://apps.volvocars.us/ownersdocs/1990/1990_740/90740_03.htm (Pg. 8, No. 10) AC  SignatureIn America, through pressure of conformity, there is freedom of choice, but nothing to choose from - Peter Ustinov. >>>This model doesn't have a dimmer rheostat. >> [quoted text clipped - 6 lines] > > AC That's the older style dash like my '87 has, didn't they update it in '90? > That's the older style dash like my '87 has, didn't they update it in '90? No, not till '91. To the OP: If you remove the cluster and join the red and blue wires going from the circuit board to the dimmer together, the dimmer is out of the circuit. The dash lights then come on full bright only. SignatureMike F. Thornhill (near Toronto), Ont. Replace tt with t (twice!) and remove parentheses to email me directly. (But I check the newsgroup more often than this email address.) >>That's the older style dash like my '87 has, didn't they update it in '90? > [quoted text clipped - 3 lines] > going from the circuit board to the dimmer together, the dimmer is out > of the circuit. The dash lights then come on full bright only. Well since he thought it doesn't have a dimmer it wouldn't surprise me at all if it just got turned down all the way while trying to set the clock or something. You got it! Not driving this car very often, my daughter turned the dimmer down while she thought she was trying to reset the clock for daylight savings. When I looked quickly at the dash I was looking for a dimmer near the headlight switch. That little black post just blends into the dash. I've only had this car for 13 years DUH!!!! It has become easier to post the problem on this newsgroup than to give it much thought. Thanks to all. > Well since he thought it doesn't have a dimmer it wouldn't surprise me > at all if it just got turned down all the way while trying to set the > clock or something. |
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