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LDV Maxus SWB van fog lights failed~ no voltage at lamps, remove dash check out going side of switch~ok, operate switch, can hear relay deep in the dash somewhere clicking.

Light switch~ pos. zero to side lts ~ can hear different relay click and can feel it is the left relay of two in the fuse & relay block under right-hand pocket in dash below right vent. Light sw pos. side to head light ~ no relay click but head lights work in dip & main beam. Swap the two relays in relay/fuse block ~ lights switch, side to main relay clicks and fog lights work!! replace dash and switches...fog lts fail to work~ jiggle fuse block, remove dash and switches again swap relays back and forth.......nothing!! Is this the head light relay/it's base connection...a familiar problem? I'm obviously fairly close just hate not knowing for sure what to look at, any advise very welcome, many thanks in advance. John

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  • Cars & Trucks Master
  • 4,201 Answers

Check fuses - relay may work but power comes from fuse and then gets switched by relay to lights

Posted on Dec 28, 2016

Testimonial: "Thank you Brett, I'll have a look and let you know"

  • 3 more comments 
  • Brett Duxbury
    Brett Duxbury Dec 28, 2016

    check contact on relay has a constant 12v to be switched by the relay contacts to the fog light

  • John Cheney Jan 03, 2017

    Relay is in ETACS unit flipped cover off relay all apparently ok and has 12v on contacts but fogs still not working. Any thoughts?

  • Brett Duxbury
    Brett Duxbury Jan 03, 2017

    are you getting voltage at the fog light end of the wiring when you switch on the fog light switch. Also fog lights may require headlights to be on for fog lights to work.

  • John Cheney Jan 10, 2017

    Checked the relays using a 9v battery (PP3)all ok also checked continuity of n/c & n/o relay contacts ~ ok. found driver for relays defective. jumped a wire from relay output to fog lt sw got van past MOT, wayhey!! now will remove unit and send for repair.
    Thank you for your comments.
    All the best for 2017
    John

  • John Cheney Jan 10, 2017

    ps.... there are 2 relay units on the ETACS board and 2 x relays in each unit (4 in total) if looking at the board with the relays on the left, the relay in the unit closest to the edge of the board and nearest to the multi pin connector strip is for the intermittent delay of the wipers, the 2nd in the same unit does the fog lights and the other 2 x relays of the inboard unit both switch together when the fog lts are sw'd on.
    I hope this info helps someone else.

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Do you know how to test electrical circuit's using a wiring diagram an a voltmeter ? Reading how the headlamps are suppose to work ,then testing is how to find the problem .
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The headlamps may be turned ON 2 different ways. First, when the driver places the headlamp switch in the HEADLAMP position, for normal operation. Second, with the headlamp switch placed in the AUTO position, for automatic lamp control (ALC). During ALC, the headlamps will be OFF in daylight conditions, or low beam operation in low light conditions. Battery positive voltage is supplied to the low beam relay and the high beam relay in the underhood fuse block. When low beam headlamps are requested, the body control module (BCM) supplies ground to the coil side of the low beam relay. This activates the relay and the relay supplies voltage to the left hand low beam headlamp through the LH LOW BEAM fuse and to the right hand low beam headlamp through the RH LOW BEAM fuse. Ground for the left hand low beam headlamp is provided at G101. Ground for the right hand low beam headlamp is provided at G102. When high beam headlamps are requested, the BCM supplies ground to the coil side of the high beam relay. This activates the relay and the relay supplies voltage to the left hand high beam headlamp through the LH HIGH BEAM fuse and to the right hand high beam headlamp through the RH HIGH BEAM fuse. Ground for the left hand high beam headlamp is provided at G101. Ground for the right hand high beam headlamp is provided at G102.

Free wiring diagrams here http://www.bbbind.com/free-tsb Enter vehicle info. Year , make , model an engine . Under system click on lighting , then under subsystem click on headlamps . Click the search button ,then the blue link .

Video's on youtube on electrical testing

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2002 Cadillac escalade driver side windows don't work but passenger windows do work. The drive side ones quit all of the sudden and also my radio doesn't turn off what is my problem? And how do I fix it?


Right side of the vehicle has a different power supply then left side . Two relay's . RAP #1 & RAP #2 . The RAP #1 relay supply's power to the radio an driver side power windows . I think maybe you have two different problems . The radio not turning off, maybe caused by the RAP relay having stuck contacts . Driver side windows not working , could have broken wire inside the flex boot from the body to the driver door .
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On the lower left side of the I/P
The RAP #1 relay is turned on by the BCM - body control module . Could have a DTC - diagnostic trouble code stored .
Do you know how to test automotive electrical circuit's use a wiring diagram an a DMM - digital multi-meter ? Pull the driver door panel off an check power an ground circuit's for the driver window switch . Free wiring diagrams here
http://www.bbbind.com/free_tsb.html Enter vehicle info. Year , Make , Model an engine . Under system click on body & accessories , then under subsystem click on power windows . Click the search button then the blue link .
The Trainer 24 Power Window Troubleshooting

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There is a relay in the under hood fuse box , blower motor relay .When switched to high it energizes the relay allowing power from the HVAC fuse /30 amp to flow direct to the blower motor. from pin 30 to pin 87 , if you look on the side of the relay there is a diagram .For all other speeds the current flows from the switch through the resistor through pin 87a to pin 30 on to the blower motor ! Check the HVAC fuse in the under hood fuse block .IF the fuse is good check for continuity between the fuse side with out B+ that means pulling the fuse and using a volt meter to see which side has power and checking the side that doesn't have power to pin 87 at the relay socket ! Probably a bad fuse or stuck relay . Pull that relay and try a different one. You can get wiring diagram at www.bbbind.com click on technical information ,then click on Technical Service Bulletins & Wiring Diagrams .then on next page go down to the bottom and click on I agree . next page click wiring diagrams ,then just fill in you vehicle information .then HVAC system . click on diagram, then you will see 7 links , click on the 5th one and that's the diagram for the blower motor circuit !

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You can't turn them on manually with the switch . You have the switch set on auto ?
Headlamps
You can use the headlamps in two different ways.
• Place the headlamp switch in the ON position for normal operation.
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