Pinpoint Test

1. Ignition OFF.
2. Disconnect: AWD Relay Module.
3. Ignition ON.
4. Measure:

AWD Relay Module			AWD Relay Module
C4379			C4379
Pin	Circuit	Measurement / Action	Pin	Circuit
1	CBK03 (GY)		4	GD349 (BK/GY)

Is the voltage greater than 11 volts?

1. Yes:  GO to 3  .
2. No  : GO to 2  .

1. Measure:

AWD Relay Module			Ground
C4379			Ground
Pin	Circuit	Measurement / Action	Pin	Circuit
1	CBK03 (GY)		-	Ground

Is the voltage greater than 11 volts?

1. Yes:  REPAIR the AWD relay module ground circuit for an open.
2. No  : VERIFY BJB fuse 70 (10A) is OK. If fuse is OK, REPAIR the AWD relay module voltage supply circuit for an open. If BJB fuse 70 (10A) is not OK, REFER to the appropriate OEM WIRING DIAGRAMS to identify possible causes of the circuit short.

1. Ignition OFF.
2. Disconnect: PCM C175B.
3. Ignition ON.
4. Measure:

AWD Relay Module			Ground
C4379			Ground
Pin	Circuit	Measurement / Action	Pin	Circuit
3	VCF35 (GN)		-	Ground
6	VCF34 (GN)		-	Ground

Is any voltage present?

1. Yes:  REPAIR the affected circuit(s) for a short to voltage.
2. No  : GO to 4  .

1. Ignition OFF.
2. Measure:

AWD Relay Module			Ground
C4379			Ground
Pin	Circuit	Measurement / Action	Pin	Circuit
3	VCF35 (GN)		-	Ground
6	VCF34 (GN)		-	Ground

Are the resistances greater than 10, 000 ohms?

1. Yes:  GO to 5  .
2. No  : REPAIR the affected circuit(s) for a short to ground.

1. Measure:

AWD Relay Module			PCM
C4379			C175B
Pin	Circuit	Measurement / Action	Pin	Circuit
3	VCF35 (GN)		54	VCF35 (GN)
6	VCF34 (WH)		3	VCF34 (WH)

Are the resistances less than 3 ohms?

1. Yes:  GO to 6  .
2. No  : REPAIR the affected circuit(s) for an open.

1. Measure:

AWD Relay Module			AWD Relay Module
C4379			C4379
Pin	Circuit	Measurement / Action	Pin	Circuit
3	VCF35 (GN)		6	VCF34 (WH)

Is the resistance greater than 10, 000 ohms?

1. Yes:  GO to 7  .
2. No  : REPAIR the affected circuit(s) for a short together.

1. Ignition OFF.
2. Disconnect and inspect all PCM connectors and the AWD relay module connector.
3. 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
4. Reconnect the PCM connectors and the AWD relay module connector. Make sure they seat and latch correctly.
5. Operate the system and determine if the concern is still present.

Is the concern still present?

1. 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 AWD relay module. REFER to All-Wheel Drive (AWD) Relay Module . CLEAR all DTCs  . REPEAT self-test. If DTC P188C or P188D is retrieved again, INSTALL a new PCM. REFER to POWERTRAIN CONTROL MODULE (PCM) - 3.5L TI-VCT
2. 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.