Diagnosis Procedure

WARNING: This page is about a different car, the 2016 Infiniti Q50. However, it is still accessible from the selected car via links, so may be relevant.

CHECK SELF SHUT-OFF RELAY OUTPUT SIGNAL CIRCUIT

Check the voltage between HPCM harness connector and ground as per the following conditions.

+		-	Condition	Voltage (Approx.)
HPCM
Connector	Terminal
B14	16	Ground	Ignition switch: ON	More than battery voltage - 2.0 V
	16		Ignition switch: OFF	Less than 2.0 V
	17		Ignition switch: ON	More than 9.5 V
	17		Ignition switch: ON → OFF	After turning ignition switch OFF, battery voltage will exist for a few seconds, then drop to approximately 0 V.

Is the inspection result normal?

YES

Perform INTERMITTENT INCIDENT .

NO

GO TO STEP 2 .

CHECK SELF SHUT-OFF RELAY CIRCUIT - 1

Disconnect 12 V battery negative cable terminal.
Remove fuse.

Check the continuity between fuse terminals.

+	-	Continuity
Fuse and fusible link block No. 1
Fuse No.
X	90	Not existed

Refer to WIRING DIAGRAM - BATTERY POWER SUPPLY - .

Also check harness for short to ground and short to power.

Is the inspection result normal?

YES

GO TO STEP 3 .

NO

Repair or replace error-detected parts.

CHECK SELF SHUT-OFF RELAY CIRCUIT - 2

Disconnect HPCM harness connector.
Remove self shut-OFF relay.

Check the continuity between HPCM harness connector and self shut-OFF relay.

+		-	Continuity
HPCM
Connector	Terminal
B14	16	Self shut-OFF relay	Existed

Refer to WIRING DIAGRAM - BATTERY POWER SUPPLY - .

Also check harness for short to ground and short to power.

Is the inspection result normal?

YES

Perform INTERMITTENT INCIDENT .

NO

Repair or replace error-detected parts.