Pinpoint Test

NOTE: Before beginning diagnostics, visually inspect the trailer tow connector mounted on the bumper for signs of corrosion or damage. Repair or install a new trailer tow connector as required.

CHECK FOR VOLTAGE AT THE TRAILER TOW CONNECTOR

Ignition ON.

For a trailer tow 4-pin connector, measure:

Trailer Tow			Ground

C439			Ground
Pin	Circuit	Measurement / Action	Pin	Circuit
1	CAT09 (GN)		-	Ground
2	CAT06 (YE)		-	Ground
3	CAT17 (BN)		-	Ground

For a trailer tow 7-pin connector, measure:

Trailer Tow Connector			Ground

Trailer Tow Connector			Ground
Pin	Circuit	Measurement / Action	Pin	Circuit
1 (trailer tow left stop/turn)	CAT06 (YE)		-	Ground
4 (trailer tow right stop/turn)	CAT09 (GN)		-	Ground
6 (trailer tow parking)	CAT17 (BN)		-	Ground
7 (trailer tow reversing)	CAT06 (YE)		-	Ground

Is any voltage present?

Yes: GO to 2 .
No: The vehicle is operating correctly. SEND the trailer to an authorized camper/trailer repair facility.

CHECK THE RELAY OUTPUT CIRCUIT TO THE TRAILER TOW CONNECTOR FOR A SHORT TO VOLTAGE

Ignition OFF.
Disconnect: Suspect Trailer Tow Relay.
Ignition ON.

For a trailer tow 4-pin connector, measure:

Trailer Tow			Ground

C439			Ground
Pin	Circuit	Measurement / Action	Pin	Circuit
1	CAT09 (GN)		-	Ground
2	CAT06 (YE)		-	Ground
3	CAT17 (BN)		-	Ground

For a trailer tow 7-pin connector, measure:

Trailer Tow Connector			Ground

Trailer Tow Connector			Ground
Pin	Circuit	Measurement / Action	Pin	Circuit
1 (trailer tow left stop/turn)	CAT06 (YE)		-	Ground
4 (trailer tow right stop/turn)	CAT09 (GN)		-	Ground
6 (trailer tow parking)	CAT17 (BN)		-	Ground
7 (trailer tow reversing)	CAT06 (YE)		-	Ground

Is any voltage present?

Yes: REPAIR the circuit in question.
No: For the trailer tow parking or reversing lamps, INSTALL a new trailer tow relay.
For a trailer tow left or right stop/turn lamp, GO to 3 .

CHECK FOR VOLTAGE TO THE TRAILER TOW RELAY COIL

For the trailer tow left stop/turn lamp, measure:

BJB			Ground

Trailer Tow Left Stop/Turn Relay			Ground
Pin	Circuit	Measurement / Action	Pin	Circuit
2	CLS18 (GY/BN)		-	Ground

For the trailer tow right stop/turn lamp, measure:

BJB			Ground

Trailer Tow Right Stop/Turn Relay			Ground
Pin	Circuit	Measurement / Action	Pin	Circuit
2	CLS19 (VT/OG)		-	Ground

Is any voltage present?

Yes: GO to 4 .
No: INSTALL a new trailer tow relay.

CHECK THE BCM OUTPUT CIRCUIT FOR A SHORT TO VOLTAGE

Ignition OFF.
Disconnect: BCM C2280D.
Ignition ON.

For the trailer tow left stop/turn lamp, measure:

BJB			Ground

Trailer Tow Left Stop/Turn Relay			Ground
Pin	Circuit	Measurement / Action	Pin	Circuit
2	CLS18 (GY/BN)		-	Ground

For the trailer tow right stop/turn lamp, measure:

BJB			Ground

Trailer Tow Right Stop/Turn Relay			Ground
Pin	Circuit	Measurement / Action	Pin	Circuit
2	CLS19 (VT/OG)		-	Ground

Is any voltage present?

Yes: REPAIR the circuit in question.
No: GO to 5 .

CHECK FOR CORRECT BCM OPERATION
1. Disconnect and inspect all BCM connectors.
2. Repair:
  - corrosion (install new connector or terminals - clean module pins)
  - damaged or bent pins - install new terminals/pins
  - pushed-out pins - install new pins as necessary
3. Reconnect the BCM connectors. Make sure they seat and latch correctly.
4. Operate the system and determine if the concern is still present.
Is the concern still present?
- Yes: CHECK OASIS for any applicable TSBs . If a TSB exists for this concern, DISCONTINUE this test and FOLLOW TSB instructions. If no TSBs address this concern, INSTALL a new BCM. REFER to BODY CONTROL MODULE (BCM) - WITHOUT INTELLIGENT ACCESS (IA) , or REFER to BODY CONTROL MODULE (BCM) - WITH INTELLIGENT ACCESS (IA) .
- No: The system is operating correctly at this time. The concern may have been caused by module connections. ADDRESS the root cause of any connector or pin issues.