Differential Lock Mode Switch

Description
Sends differential lock ON/OFF request signals to the differential lock control module.

Component Function Check

1. CHECK DIFFERENTIAL LOCK MODE SWITCH OPERATION
1. Turn ignition switch ON.
2. Select "D-LOCK SW SIG" of DIFF LOCK data monitor items.
3. While operating the differential lock mode switch, check that the display value changes between ON/OFF.
Switch ON Display item ON
Switch OFF Display item OFF
Does the data monitor item display the same as the switch inputs?
YES >> Differential lock mode switch is operating properly.
NO >> Check differential lock mode switch. Refer to "Diagnosis Procedure".

Diagnosis Procedure

1. CHECK DIFFERENTIAL LOCK MODE SWITCH POWER SUPPLY CIRCUIT








1. Disconnect differential lock mode switch harness connector M72.
2. Turn ignition switch ON.
3. Check voltage between differential lock mode switch harness connector M72 terminal 3 and ground.
Is battery voltage present?
YES >> GO TO 2.
NO >> Repair harness or connector.

2. CHECK DIFFERENTIAL LOCK MODE SWITCH SIGNAL








1. Turn ignition switch OFF.
2. Connect differential lock mode switch connector M72.
3. Disconnect the differential lock control unit connector M77.
4. Turn ignition switch OFF.
5. Check voltage between differential lock control unit harness connector terminals and ground.
Are the voltage test results as specified?
YES >> Replace the differential lock control unit.
NO >> GO TO 3.

3. CHECK DIFFERENTIAL LOCK MODE SWITCH
1. Turn ignition switch OFF.
2. Disconnect differential lock mode switch harness connector M72.








3. Operate differential lock mode switch and check continuity between differential lock mode switch terminals.
Are continuity test results as specified?
YES >> GO TO 4.
NO >> Replace differential lock mode switch.

4. CHECK HARNESS BETWEEN DIFFERENTIAL LOCK CONTROL UNIT AND DIFFERENTIAL LOCK MODE SWITCH








1. Check continuity between differential lock control unit harness connector M77 (A) and differential lock mode switch connector M72 (B).
2. Check continuity between differential lock control unit harness connector M77 (A) and ground.





Are continuity test results as specified?
YES >> Replace the differential lock control unit.
NO >> Repair harness or connector.