High beams dont work
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Laughing Gas
Joined: Oct 2007
Posts: 773
Likes: 1
High beams dont work
Low beams work fine, but when I try the high beams the lights go out completely. When I pull the lever towards me (flash to pass), the high beams still don't come on but the low beams stay on. I've check the fuses and none were bad.
Fleet Mechanic
Joined: Feb 2007
Posts: 1,716
Likes: 0
From: Boston, MA
Year? Year? Year?
Fleet Mechanic
Joined: Feb 2007
Posts: 1,716
Likes: 0
From: Boston, MA
I know on some years the multifunction switch is a common issue and also has a TSB. I also noticed that you have a post for the truck staying in park with the engine running. did these issues happen at the same time?
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Laughing Gas
Joined: Oct 2007
Posts: 773
Likes: 1
I'm not sure but I believe they are not related issues that occurred at different times. The truck is my brother's and he asked me to fix these problems (along with a few others I figured out already). He kinda let the truck gradually fall apart since he last had it inspected a year or two ago.
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Laughing Gas
Joined: Oct 2007
Posts: 773
Likes: 1
I tried replacing the multifunction switch, but it did not fix it. How do I check the bulbs? I looked at them and they physically look alright.
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New User
Joined: Jul 2010
Posts: 23
Likes: 0
the high beams have their own fuse. i had the same problem and then i looked in the fuse pannel in the cab and their it was a blown fuse. i always jumpt to the hard stuff befor looking into the small stuff.
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Cargo Master
Joined: May 2001
Posts: 3,208
Likes: 13
Mine did that it was a 10 amp fuse in the cab fuse panel. I don't have my manual with me but I think there may also Be a relay or gem module involved in this circuit also. I will check when I get home this evening.
Cargo Master
Joined: May 2001
Posts: 3,208
Likes: 13
I checked the manual no relays no gems 15 amp fuse in slot 33 supplies the high beams
Per manual
Measure the resistance between the LH headlamp C1021 pin 1, circuit 12 (LG/BK), harness side and central junction box (CJB) fuse 33 pin 2; and between the RH headlamp C1041 pin 1, circuit 12 (LG/BK), harness side and CJB fuse 33 pin 2.
Are the resistances less than 5 ohms?
Yes
RECONNECT LH headlamp C1021 and RH headlamp C1041. GO to C2 .
No
REPAIR the circuit. TEST the system for normal operation
C2
Place the headlamp switch in the ON position.
Place the multifunction switch in the high beam position.
Measure the voltage between the CJB fuse 33 pin 1, and ground.
Is the voltage greater than 10 volts?
Yes
INSTALL new headlamp bulbs. REFER to Bulb—Headlamp in this section. TEST the system for normal operation.
No
GO to C3 .
C3
Measure the resistance between the multifunction switch C202b pin 5, circuit 632 (GY/OG), harness side and the CJB fuse 33 pin 1.
Is the resistance less than 5 ohms?
Yes
INSTALL a new multifunction switch. REFER to Section 211-05 . TEST the system for normal operation.
No
REPAIR the circuit. TEST the system for normal operation.
.
Per manual
Measure the resistance between the LH headlamp C1021 pin 1, circuit 12 (LG/BK), harness side and central junction box (CJB) fuse 33 pin 2; and between the RH headlamp C1041 pin 1, circuit 12 (LG/BK), harness side and CJB fuse 33 pin 2.
Are the resistances less than 5 ohms?
Yes
RECONNECT LH headlamp C1021 and RH headlamp C1041. GO to C2 .
No
REPAIR the circuit. TEST the system for normal operation
C2
Place the headlamp switch in the ON position.
Place the multifunction switch in the high beam position.
Measure the voltage between the CJB fuse 33 pin 1, and ground.
Is the voltage greater than 10 volts?
Yes
INSTALL new headlamp bulbs. REFER to Bulb—Headlamp in this section. TEST the system for normal operation.
No
GO to C3 .
C3
Measure the resistance between the multifunction switch C202b pin 5, circuit 632 (GY/OG), harness side and the CJB fuse 33 pin 1.
Is the resistance less than 5 ohms?
Yes
INSTALL a new multifunction switch. REFER to Section 211-05 . TEST the system for normal operation.
No
REPAIR the circuit. TEST the system for normal operation.
.
New User
Joined: Oct 2010
Posts: 1
Likes: 0
I have an 08 F150, Same thing just happened to me. Lights go out completely when I turn on the hi beams. I still get the blue hi beam light and it only when I push it forward. The low beams are working fine.
Did you ever figure out what was wrong?
Did you ever figure out what was wrong?
Laughing Gas
Joined: Aug 2003
Posts: 1,175
Likes: 9
From: So. Cal.
Check the simple things first: is the light bulb good?
Many people will fail to notice only one burned out bulb. Then when the second one goes, they jump to the conclusion that both went out at the same time. So before you start looking for something complicated, check the bulbs.
Many people will fail to notice only one burned out bulb. Then when the second one goes, they jump to the conclusion that both went out at the same time. So before you start looking for something complicated, check the bulbs.
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