On-Vehicle Inspection

CHECK DIFFERENTIAL LOCK INDICATOR SWITCH POSITION
1. Start the engine, and shift the transfer shift lever to the "H" position.
2. Check that the center differential indicator light comes on when the switch is in "ON" position. Check that the light goes off when the switch is in "OFF" position.
Fig 1: Checking Differential Lock Indicator Switch Position
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
CHECK SHIFT LEVER POSITION
1. Start the engine, and turn the center differential lock switch OFF.
2. Check that the center differential indicator light comes on when the transfer shift lever is shifted to the "L" position. Check that the light goes off when the lever is shifted to the "N" or "H" position.
Fig 2: Checking Shift Lever Position
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

INSPECT CENTER DIFFERENTIAL LOCK CONTROL RELAY

Check that continuity exists between each terminal, as shown in the chart.

OK : Go to next step

TESTER CONNECTION AND SPECIFIED CONDITION

Tester Connection

Specified Condition

1 - 2

Continuity

2 - 4

Continuity

6 - 7

⁽¹⁾

⁽¹⁾	*: There is a diode between the terminals 6 and 7.

Fig 3: Identifying Center Differential Lock Control Relay Connectors

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

If no continuity exists, check that continuity exists when changing the position of positive (+) probe for the position of negative (-) probe of the tester.

Apply battery positive voltage between each terminal and check that continuity exists between each terminal, as shown in the chart.

OK : Go to next step

TESTER CONNECTION AND SPECIFIED CONDITION

Battery Voltage Applied Terminal	Tester Connection	Specified Condition
6 (+) - 5 (-)	1 - 3	Continuity
6 (+) - 5 (-)	1 - 2	No continuity
7 (+) - 2 (-)	9 - 10	No continuity
9 (+) - 10 (-)	3 - 4	Continuity
9 (+) - 10 (-)	2 - 4	No continuity

If continuity is not as specified, replace the relay.

CHECK ACTUATOR OPERATION

Raise up the front wheels, place the stopper under the rear wheels to block them, and pull up the parking brake.
Disconnect the connector of the actuator and connect it to the relay using wire.

Fig 4: Checking Actuator Operation
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
Check that the front propeller shaft can be rotated by hand.

HINT:

When inspecting the operation described above, use a heater main relay.

OK : Go to next step

INSPECTION ITEM AND SPECIFIED CONDITION

Inspection Item	Specified Condition
Center Differential Free --> Lock	Front propeller shaft cannot be rotated.
Center Differential Lock --> Free	Front propeller shaft can be rotated.

Fig 5: Identifying Heater Main Relay

NOTE: Connect the terminals being careful not to touch the neighboring terminals or metallic parts of relay housing.