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Trailer Tow Control Unit Inspection Table

WARNING: This page is about a different car, the 2008 Nissan Quest. However, it is still accessible from the selected car via links, so may be relevant.
TRAILER TOW CONTROL UNIT INSPECTION CHART

Terminal No. Wire color Item Condition Voltage (Approx.)
1 BR Tail lamps signal output When tail lamps operate Battery voltage
All other conditions 0V
2 Y Stop/LH turn lamp (output) When brake pedal is depressed Battery voltage
When LH turn lamps or hazard lamps operate Battery voltage (intermittently)
All other conditions 0V
3 R/L Tail lamps signal input When tail lamps operate Battery voltage
All other conditions 0V
4 G/B LH turn lamps input When LH turn lamps or hazard lamps operate Battery voltage (intermittently)
All other conditions 0V
5 W Ground - -
6 G Stop/RH turn lamp (output) When brake pedal is depressed Battery voltage
When RH turn lamps or hazard lamps operate Battery voltage (intermittently)
All other conditions 0V
7 R Power supply - Battery voltage
8 R/G Stop lamps signal input When brake pedal is depressed Battery voltage
When brake pedal is released 0V
9 G/Y RH turn lamps input When RH turn lamps or hazard lamps operate Battery voltage (intermittently)
All other conditions 0V