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No headlamps, low-beam or high beam

 
  #1  
Old 05-30-2011, 04:26 PM
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No headlamps, low-beam or high beam

All of the sudden, last night, no headlamps! No low beam or high beam. I do have parking lights.

Here's what I have done:

New bulbs. Old bulbs' filaments looked fine.

Checked fuses. Fine.

Since I had a new wiring harness from rallylights.com and 100W/80W bulbs, I took the oppurtunity to install it. Still no headlamps.

Anybody have any ideas?
 
  #2  
Old 05-30-2011, 04:48 PM
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I checked the headlamp connector with a multi meter and there is no power. Relay gone bad?
 
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Old 05-30-2011, 04:51 PM
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do you have running lights, Brake lights, or dash lights???
 
  #4  
Old 05-30-2011, 04:58 PM
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Do you have DLR (Day Light Running Lights) ?
 
  #5  
Old 05-30-2011, 05:02 PM
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I have all brake lights, parking lights, etc. I do not have DRL.
 
  #6  
Old 05-30-2011, 05:20 PM
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I would check your relay, find another relay to swap it with.
 
  #7  
Old 05-31-2011, 08:30 AM
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Here is what I found out:

Condition: Both headlamps inoperative

Possible sources:
Central Junction Box fuse 7
Circuitry
Headlamp switch
Multifunction switch
Central Junction Box

Actions:
A1 CHECK FOR VOLTAGE TO THE HEADLAMP SWITCH
Measure the voltage between the headlamp
switch C205a pin 8, circuit 196 (DB/OG),
harness side and ground.

l
Is the voltage greater than 10 volts?
Yes

GO to
A3 .

No
GO to A2 .

A2 CHECK CIRCUIT 196 (DB/OG) FOR AN OPEN
Measure the resistance between the
headlamp switch C205a pin 8, circuit 196
(DB/OG), harness side and the CJB C270b
pin 12, circuit 196 (DB/OG), harness side.
l
Is the resistance less than 5 ohms?
Yes

INSTALL a new CJB. TEST the system for
normal operation.
No
REPAIR the circuit. TEST the system for
normal operation.

A3 CHECK CIRCUIT 15 (RD/YE) FOR AN OPEN
Measure the resistance between the
headlamp switch C205a pin 9, circuit 15
(RD/YE), harness side and the multifunction
switch C202a pin 8, circuit 15 (RD/YE),
harness side.
l
Is the resistance less than 5 ohms?
Yes
RECONNECT the headlamp switch. GO to
A4 .

No
REPAIR the circuit. TEST the system for
normal operation.

A4 CHECK FOR VOLTAGE TO THE MULTIFUNCTION SWITCH
MULTIFUNCTION SWITCH
Place the headlamp switch in the ON position.
Measure the voltage between the
multifunction switch C202a pin 8 circuit 15
(RD/YE), harness side and ground.
l
Is the voltage greater than 10 volts?
Yes

TURN the headlamp switch off. GO to A5 .
No
INSTALL a new headlamp switch.

A5 CHECK FOR VOLTAGE FROM THE MULTIFUNCTION SWITCH
Place the headlamp switch in the ON position.
Place the multifunction switch in the low beam
position.
Measure the voltage between the CJB C270g
pin 4, circuit 13 (RD/BK), harness side and
ground.
l
Is the voltage greater than 10 volts?
Yes

REPAIR circuit 57 (BK). TEST the system for
normal operation.
No
INSTALL a new multifunction switch.

 
  #8  
Old 05-31-2011, 11:41 AM
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My experience on Fords with the Multifunction switch is to replace the switch after first checking the fuses, bulbs, and wiring. Most of the time this fixes the problem.

Intermittent turn signal/brake light failures is another common problem caused by the Multifunction switch.
 
  #9  
Old 05-31-2011, 03:17 PM
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Problem solved! Good ol' 30A fuse #7. I didn't check that one initially, because the book said #7 was for high beams, and both low and high beams were inoperative. The Ford diagnostic software told me to check #7.
 
  #10  
Old 05-31-2011, 04:45 PM
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Good deal, Thanks for the update.
 
  #11  
Old 05-31-2011, 11:06 PM
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cheap fix! a new multi switch isn't too expensive, though under $100 I think.
I had to replace mine back in 2008. They basically have contacts that just wear out and the whole piece has to be replaced.
Did you check the two relay boxes on driver's side fenderwell, too?
 
  #12  
Old 06-01-2011, 12:18 AM
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In 2002 Ford changed the electrical system and apparently dropped the separation between the high and low beam systems. My 2001 has three circuits (and three fuses), one for each low beam and one for both high beams. I prefer the old system.
 
 
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