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.

Problem Symptoms Table

PROBLEM SYMPTOMS TABLE HINT: Use the table below to help determine the cause of problem symptoms. If multiple suspected areas are listed, the potential causes of the symptoms are lis ...

Seat Memory Switch

Components COMPONENTS ILLUSTRATION Removal REMOVAL PROCEDURE 1. REMOVE FRONT DOOR LOWER FRAME BRACKET GARNISH LH 2. REMOVE NO. 2 DOOR INSIDE HANDLE BEZEL LH 3. REMOVE FRONT DOOR TR ...

Other materials about Toyota 4Runner:

Telephone Antenna
Components COMPONENTS ILLUSTRATION Removal REMOVAL PROCEDURE 1. DISCONNECT CABLE FROM NEGATIVE BATTERY TERMINAL NOTICE: When disconnecting the cable, some systems need to be initialized after the cable is reconnected (See page ). 2. REMOVE RO ...

Problem Symptoms Table
PROBLEM SYMPTOMS TABLE HINT: Use the table below to help determine the cause of problem symptoms. If multiple suspected areas are listed, the potential causes of the symptoms are listed in order of probability in the "Suspected Area" ...