Frontier 2WD L4-2.5L (QR25DE) (2005)
The trailer power supply is controlled by trailer tow relay 2.
When the ignition switch is in the ON or START position, power is supplied
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through 10 A fuse (No. 38, located in the IPDM E/R)
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through IPDM E/R terminal 27
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to trailer tow relay 2 terminal 1.
When energized, trailer tow relay 2 power is supplied
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through trailer tow relay 2 terminals 5 and 7
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to trailer connector terminal 5.