Inspection Procedure

1. Use the intelligent tester to check for normal function of the multiplex communication system.
   1. (ECU unconnected, communication line malfunctioning) Without DTC B1214, B1215 or B 1262 outputs, proceed to A.
   2. (ECU unconnected, communication line malfunctioning) With DTC B1214, B1215 or B 1262 outputs, proceed to B.

B: GO TO  MULTIPLEX COMMUNICATION SYSTEM 

A: Go to next step. 

1. Remove the HEATER fuse from the instrument panel J/ B.
2. Remove the RR-DEF fuse from the FL block.
3. Check the resistance.

   Standard resistance: Below 1 Ω 

NG : REPLACE FUSE 

OK : Go to next step. 

1. Connect the intelligent tester (with CAN VIN) to the DLC3.
2. Turn the ignition switch on.
3. Perform the ACTIVE TEST according to the display on the tester.

AIR CONDITIONER: 

NG : Go to step   5 

OK : Go to next step. 

NG : GO TO  AIR CONDITIONING SYSTEM 

OK : REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY 

1. Check the voltage of the terminal of the J/B.

Fig 1: Identifying Junction Block Connectors

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Standard voltage 

NG : REPAIR OR REPLACE HARNESS OR CONNECTOR (POWER SOURCE CIRCUIT) 

OK : Go to next step. 

1. Check the voltage of the terminal to the following condition.

• Engine running.
• A/C switch is OFF.
• Rear defogger and deicer switch is ON.

Result 

Fig 2: Identifying Junction Block (Mode Monitor Terminal)

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

B: Go to step   12 

A: Go to next step. 

1. Remove the junction block No.2.
2. Connect the battery positive (+) lead to terminal 2B-8 and battery negative (-) terminal lead to terminal 2H-12, 2B-7 and 2H-11.
3. Check the voltage of the RR-DEF relay terminals.
   Fig 3: Identifying Junction Block (RR-DEF Relay)

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   Standard voltage 

   TESTER CONNECTION SPECIFIED CONDITION
   
   

   Tester Connection	Condition	Specified Condition
   2B-7 - 2H-13	Always	Below 1 V

4. Connect another battery positive (+) lead to the terminal 2H-12.
5. Check the voltage of the RR-DEF relay terminals.

Standard voltage 

NG : REPLACE JUNCTION BLOCK 

OK : Go to next step. 

1. Disconnect the A8 connector.
2. Measure the voltage according to the value(s) in the table below.

Standard voltage 

Fig 4: Disconnecting A8 Connector

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NG : REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK : Go to next step. 

1. Connect the A8 connector.
2. Connect the intelligent tester to the DLC3.
3. Measure the voltage according to the value(s) in the table below.

Standard voltage 

Fig 5: Connecting A8 Connector

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

AIR CONDITIONER:

NG : REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY 

OK : Go to next step. 

Fig 6: Wrapping Piece Of Tin Foil Around Tip Of Negative Tester Probe

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

1. Turn the ignition switch on.
2. Turn the defogger switch ON.
   Fig 7: Measuring Rear Window Defogger Wire Voltage

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
3. Check the voltage at the center of each defogger wire, as shown in the illustration.

   Standard voltage 

   VOLTAGE CRITERIA
   
   

   Voltage	Criteria
   Approx .5 V	Wire is not broken
   Approx. 10 or 0 V	Wire is broken

   HINT:

   If there is approximately 10 V, the wire may be broken between the center of the wire and the wire end on the battery side. If there is no voltage, the wire may be broken between the center of the wire and the end on the ground side.

4. Place the voltmeter positive (+) lead against the defogger wire on the battery side.
5. Place the voltmeter negative (-) lead with the foil strip against the wire on the ground side.
6. Slide the positive (+) lead from the battery side to the ground side.
7. The point where the voltage drops from approximately 10 V to 0 V is where the defogger wire is broken.

   HINT:

   If the defogger wire is not broken, the voltmeter indicates 0 V at the positive (+) end of the defogger wire but gradually increases to approximately 12 V as the meter probe moves to the other end.

Fig 8: Checking Defogger Wires For Breaks

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NG : REPAIR REAR WINDOW DEFOGGER WIRE 

OK : Go to next step. 

1. Disconnect the N4, N5 defogger and 2B J/B connectors.
2. Check the resistance of the wire harness side connectors.

Standard resistance 

Fig 9: Identifying N4, N5 Rear Window Defogger And 2B J/B No. 2 Connector Terminals

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NG : REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK : REPLACE NOISE FILTER 

1. Disconnect the N4, N5 defogger and 2B J/B connectors.
2. Check the resistance of the wire harness side connectors.

Standard resistance 

Fig 10: Identifying N4, N5 Rear Window Defogger And 2B J/B No. 2 Connector Terminals

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NG : REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK : Go to next step. 

1. Remove the junction block No.2.
2. Connect the battery positive (+) lead to terminal 2B-8 and battery negative (-) terminal lead to terminal 2H-12, 2B-7 and 2H-11.
3. Check the voltage of the RR-DEF relay terminals.
   Fig 11: Identifying Junction Block (RR-DEF Relay)

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   Standard voltage 

   TESTER CONNECTION SPECIFIED CONDITION
   
   

   Tester Connection	Condition	Specified Condition
   2B-7 - 2H-12	Always	Below 1 V

4. Connect another battery positive (+) lead to the terminal 2H-12.
5. Check the voltage of the RR-DEF relay terminals.

Standard voltage 

NG : REPLACE JUNCTION BLOCK 

OK : REPLACE NOISE FILTER