Question about 2004 Dodge Ram 1500
The PCM monitors changes in input voltage from the brake switch. If the PCM does not detect PCM terminal 1AU voltage changes while alternately accelerating and decelerating 8 times, the PCM determines that brake switch circuit has malfunctioned.
• Brake switch malfunction
• Poor connection of brake switch connector or PCM connector
• Short to power supply in wiring harness between brake switch terminal D and PCM connector terminal 1AU
• Open circuit in wiring harness between brake switch terminal D and PCM connector terminal 1AU
• Open circuit in wiring harness between battery positive terminal and brake switch terminal A
• PCM malfunction
Do you have an immobilizer on this truck? Possible short circuit? Do you have added trailer wiring on this truck? Possible short circuit? Are your brake lights working normally? If not, is the brake light fuze OK?
Posted on Jan 04, 2011
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Posted on Jan 02, 2017
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