Toyota 4Runner: On-vehicle Inspection

Toyota 4Runner Service Manual / Vehicle Interior / Seat / Seat Heater System / On-vehicle Inspection

ON-VEHICLE INSPECTION

PROCEDURE

1. INSPECT SEAT HEATER CONTROL SUB-ASSEMBLY LH

(a) Disconnect the b2 seat heater control sub-assembly LH connector.

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
b2-6 (E) - Body ground	Always	Below 1 Ω

Standard Voltage:

Tester Connection	Switch Condition	Specified Condition
b2-1 (SWL) - b2-6 (E)	Ignition switch ON Seat heater switch LH off	Below 1 V
b2-1 (SWL) - b2-6 (E)	Ignition switch ON Seat heater switch LH on	11 to 14 V
b2-4 (B) - b2-6 (E)	Ignition switch off	Below 1 V
b2-4 (B) - b2-6 (E)	Ignition switch ON	11 to 14 V

Text in Illustration

*a	Front view of wire harness connector (to Seat Heater Control Sub-assembly LH)

If the result is not as specified, there may be a malfunction on the wire harness side.

(d) Connect the b2 seat heater control sub-assembly LH connector.

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

Standard Voltage:

Tester Connection

Switch Condition

Specified Condition

b2-5 (THL) - Body ground

Ignition switch ON

Seat heater switch LH on, MIN → MAX

Gradual increase between value below 1 V and value from 11 to 14 V

Text in Illustration

*a	Component with harness connected (Seat Heater Control Sub-assembly LH)

If the result is not as specified, the seat heater control sub-assembly LH may have a malfunction.

2. INSPECT SEAT HEATER CONTROL SUB-ASSEMBLY RH

(a) Disconnect the a2 seat heater control sub-assembly RH connector.

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
a2-6 (E) - Body ground	Always	Below 1 Ω

Standard Voltage:

Tester Connection	Switch Condition	Specified Condition
a2-1 (SWR) - a2-6 (E)	Ignition switch ON Seat heater switch RH off	Below 1 V
a2-1 (SWR) - a2-6 (E)	Ignition switch ON Seat heater switch RH on	11 to 14 V
a2-4 (B1) - a2-6 (E)	Ignition switch off	Below 1 V
a2-4 (B1) - a2-6 (E)	Ignition switch ON	11 to 14 V

Text in Illustration

*a	Front view of wire harness connector (to Seat Heater Control Sub-assembly RH)

If the result is not as specified, there may be a malfunction on the wire harness side.

(d) Connect the a2 seat heater control sub-assembly RH connector.

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

Standard Voltage:

Tester Connection

Switch Condition

Specified Condition

a2-5 (THR) - Body ground

Ignition switch ON

Seat heater switch RH on, MIN → MAX

Gradual increase between value below 1 V and value from 11 to 14 V

Text in Illustration

*a	Component with harness connected (Seat Heater Control Sub-assembly RH)

If the result is not as specified, the seat heater control sub-assembly RH may have a malfunction.

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