Inspection Procedure

NOTE: When using the intelligent tester (with CAN VIM) or Techstream with the engine switch off to troubleshoot:
Connect the intelligent tester (with CAN VIM) or Techstream to the vehicle, and turn a courtesy switch on and off at 1.5 second intervals until communication between the tester and vehicle begins.

CHECK HARNESS AND CONNECTOR (REAR JUNCTION BLOCK ECU - MAP LIGHT)

Fig 1: Identifying S62 ECU And X6 Light Connectors

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Disconnect the S62 ECU connector.
Disconnect the X6 light connector.

Measure the resistance and voltage according to the value(s) in the table below.

Standard resistance

REAR JUNCTION BLOCK ECU - MAP LIGHT RESISTANCE

Tester Connection	Condition	Specified Condition
S62-9 (LIN) - X6-2 (LIN)	Always	Below 1 Ω
S62-9(LIN)or X6-2(LIN) - Body ground	Always	10 kΩ or higher

Standard voltage

REAR JUNCTION BLOCK ECU - MAP LIGHT VOLTAGE

Tester Connection	Condition	Specified Condition
S62-9(LIN)or X6-2(LIN) - Body ground	Always	Below 1 V

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR

OK: GO TO NEXT STEP

CHECK MAP LIGHT (BATTERY VOLTAGE AND GROUND)

Disconnect the X4 light connector.

Measure the resistance and voltage according to the value(s) in the table below.

Standard resistance

MAP LIGHT (BATTERY VOLTAGE AND GROUND) RESISTANCE

Tester Connection	Condition	Specified Condition
X4-16 (GND9) - Body ground	Always	Below 1 Ω

Fig 2: Identifying X4 Light Connector

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Standard voltage

MAP LIGHT (BATTERY VOLTAGE AND GROUND) VOLTAGE

Tester Connection	Condition	Specified Condition
X4-6 (+B) - Body ground	Always	11 to 14 V

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR

OK: GO TO NEXT STEP

REPLACE MAP LIGHT ASSEMBLY
1. Temporarily replace the map light with a new or normally functioning one (see REMOVAL ).
2. Delete the DTC (see DTC CHECK / CLEAR ).

CHECK FOR DTC

Recheck for DTC (see DTC CHECK / CLEAR ).

Result:

RESULT

Result	Proceed to
DTC B2405 output reoccurs	B
DTC B2405 output does not reoccur	A

B: REPLACE LUGGAGE ROOM JUNCTION BLOCK (REAR JUNCTION BLOCK ECU)

A: END (MAP LIGHT IS DEFECTIVE)