Diagnostic Procedure

WARNING: This page is about a different car, the 2006 Infiniti QX56. However, it is still accessible from the selected car via links, so may be relevant.

CHECK CAN COMMUNICATION LINE
Perform the self-diagnosis. Refer to "SELF-DIAGNOSTIC RESULT MODE ".

Is any malfunction in the CAN communication indicated in the results?
1. YES : Check CAN communication line. Refer to "DTC U1000 CAN COMMUNICATION LINE ".
2. NO : GO TO 2.

CHECK POWER SOURCE

Turn ignition switch "ON". (Do not start engine.)

Check the voltage between tow mode switch connector M67 terminal 1 and ground.

CONNECTOR TERMINAL VOLTAGE SPECIFICATION

Condition	Tow mode switch	Data (Approx.)
When ignition switch is turned to "ON"	ON	0V
When ignition switch is turned to "ON"	OFF	Battery voltage

OK or NG

OK : INSPECTION END
NG : GO TO 3.

Fig 1: Identifying Voltage Between Tow Mode Switch Connector M67 Terminal 1 And Ground
Courtesy of NISSAN MOTOR CO., U.S.A.

CHECK TOW MODE SWITCH

Turn ignition switch "OFF".
Disconnect tow mode switch connector.

Check continuity between tow mode switch terminals 1 and 2.

CONNECTOR TERMINAL CONTINUITY SPECIFICATION

Condition	Continuity
Tow mode switch "ON"	Yes
Tow mode switch "OFF"	No

OK or NG

OK : GO TO 4.
NG : Repair or replace tow mode switch.

Fig 2: Identifying Continuity Between Tow Mode Switch Terminals 1 And 2
Courtesy of NISSAN MOTOR CO., U.S.A.

DETECT MALFUNCTIONING ITEM
Check the following items. If any items are damaged, repair or replace damaged parts.
- Harness for short or open between combination meter connector terminal 35 and tow mode switch connector terminal 1.
- Harness for short or open between tow mode switch connector terminal 2 and ground.
OK or NG
1. OK : GO TO 5.
2. NG : Repair or replace damaged parts.
CHECK COMBINATION METER
Check the combination meter. Refer to "HOW TO PROCEED WITH TROUBLE DIAGNOSIS ".

OK or NG
1. OK : INSPECTION END
2. NO : Repair or replace damaged parts.