Inspection Procedure

CHECK FUSE (P-IG-4, P S/HTR, D-IG1-3)

Remove the P-IG-4 and P S/HTR fuses from the passenger side junction block.
Remove the D-IG 1-3 fuse from the main body ECU.

Measure the resistance of the fuses.

Standard resistance

TESTER CONNECTOR SPECIFIED CONDITION CHART

Tester Connector	Condition	Specified Condition
P-IG1-4 fuse	Always	Below 1 Ω
P S/HTR fuse	Always	Below 1 Ω
D-IG1-3 fuse	Always	Below 1 Ω

NG: REPLACE FUSE

OK: Go to next step

CHECK HARNESS AND CONNECTOR (SEAT CLIMATE CONTROL ECU - BATTERY AND BODY GROUND)

Disconnect the e4 ECU connector.

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

Standard resistance

TESTER CONNECTOR SPECIFIED CONDITION CHART

Tester Connector	Condition	Specified Condition
e4-12 (GND) - Body ground	Always	Below 1 Ω

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

Fig 1: Identifying e4 ECU Connector Terminals

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Standard voltage

TESTER CONNECTOR SPECIFIED CONDITION CHART

Tester Connector	Switch Condition	Specified Condition
e4-1 (IG) - Body ground	Engine switch on (IG)	11 to 14 V
e4-2 (SYSB) - Body ground	Always	11 to 14 V

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR

OK: Go to next step

CHECK HARNESS AND CONNECTOR (SEAT CLIMATE SWITCH RH - BATTERY AND BODY GROUND)

Disconnect the L68 switch connector.

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

Standard resistance

TESTER CONNECTOR SPECIFIED CONDITION CHART

Tester Connector	Condition	Specified Condition
L68-2 (E) - Body ground	Always	Below 1 Ω

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

Fig 2: Identifying L68 Switch Connector Terminals

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Standard voltage

TESTER CONNECTOR SPECIFIED CONDITION CHART

Tester Connector	Switch Condition	Specified Condition
L68-7 (IG) - Body ground	Engine switch on (IG)	11 to 14 V

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR

OK: Go to next step

INSPECT CLIMATE CONTROL SWITCH RH

Remove the L68 switch connector.

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

Standard resistance

TESTER CONNECTOR SPECIFIED CONDITION CHART

Tester Connector	Switch Condition	Specified Condition
5 (V5R) - 4 (VSR)	Cooler MAX → Heater MAX	Below 1 Ω → 5 kΩ

Fig 3: Identifying Climate Control Switch RH Connector Terminals

NG: REPLACE CLIMATE CONTROL SWITCH RH (See REMOVAL )

OK: Go to next step

CHECK HARNESS AND CONNECTOR (SEAT CLIMATE CONTROL ECU - SEAT CLIMATE SWITCH RH AND BODY GROUND)

Disconnect the e4 ECU connector.
Disconnect the L68 switch connector.

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

Standard resistance

TESTER CONNECTOR SPECIFIED CONDITION CHART

Tester Connector	Condition	Specified Condition
e4-14 (V5) - L68-5 (V5R)	Always	Below 1 Ω
e4-18 (VS) - L68-4 (VSR)	Always	Below 1 Ω
e4-15 (VG) - L68-3 (VOR)	Always	Below 1 Ω
e4-14 (V5) - Body ground	Always	10 kΩ or higher
e4-18 (VS) - Body ground	Always	10 kΩ or higher
e4-15 (VG) - Body ground	Always	10 kΩ or higher

Fig 4: Checking Harness And Connector (Seat Climate Control ECU - Seat Climate Switch RH And Body Ground)

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR

OK: REPLACE SEAT CLIMATE CONTROL ECU (See DISASSEMBLY )