P1838
P1838 ON SWITCH
Description
The differential lock mode switch sends differential lock ON/OFF request signals to the differential lock control unit.
DTC Logic
Diagnosis Procedure
Regarding Wiring Diagram information, .
1.CHECK DIFFERENTIAL LOCK MODE SWITCH OPERATION
1. Turn ignition switch ON.
2. Using CONSULT-III, 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.
Is the inspection result normal?
YES - Differential lock mode switch is operating properly.
NO - GO TO 2.
2.CHECK DIFFERENTIAL LOCK MODE SWITCH POWER SUPPLY CIRCUIT
1. Disconnect differential lock mode switch harness connector.
2. Turn ignition switch ON.
3. Check voltage between differential lock mode switch harness connector M149 terminal 3 and ground.
Is the inspection result normal?
YES - GO TO 3.
NO - Repair harness or connector.
3.CHECK DIFFERENTIAL LOCK MODE SWITCH SIGNAL
1. Turn ignition switch OFF.
2. Connect differential lock mode switch harness connector.
3. Check voltage between differential lock control unit harness connector M70 terminals 9, 22 and ground.
Is the inspection result normal?
YES - Replace the differential lock control unit. .
NO - GO TO 4.
4.CHECK DIFFERENTIAL LOCK MODE SWITCH
1. Turn ignition switch OFF.
2. Disconnect differential lock mode switch harness connector.
3. Operate differential lock mode switch and check continuity between differential lock mode switch terminals.
Is the inspection result normal?
YES - GO TO 5.
NO - Replace differential lock mode switch.
5.CHECK HARNESS BETWEEN DIFFERENTIAL LOCK CONTROL UNIT AND DIFFERENTIAL LOCK
MODE SWITCH
1. Check continuity between differential lock control unit harness connector M70 (A) terminals 9, 22 and differential lock mode switch harness connector M149 (B) terminals 2, 1.
2. Check continuity between differential lock control unit harness connector M70 (A) terminals 9, 22 and ground.
Is the inspection result normal?
YES - Replace the differential lock control unit. .
NO - Repair harness or connector.