Toyota 4Runner: On-vehicle Inspection

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

ON-VEHICLE INSPECTION

PROCEDURE

1. INSPECT SEAT HEATER CONTROL SUB-ASSEMBLY LH

(a) Disconnect the b24 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
b24-6 (E) - Body ground	Always	Below 1 Ω

Standard Voltage:

Tester Connection	Switch Condition	Specified Condition
b24-1 (SWL) - b24-6 (E)	Engine switch on (IG) Refreshing seat switch LH side off	Below 1 V
b24-1 (SWL) - b24-6 (E)	Engine switch on (IG) Refreshing seat switch LH side on	11 to 14 V
b24-4 (B) - b24-6 (E)	Engine switch off	Below 1 V
b24-4 (B) - b24-6 (E)	Engine switch on (IG)	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 b24 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

b24-5 (THL) - Body ground

Engine switch on (IG)

Refreshing seat 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 a15 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
a15-6 (E) - Body ground	Always	Below 1 Ω

Standard Voltage:

Tester Connection	Switch Condition	Specified Condition
a15-1 (SWR) - a15-6 (E)	Engine switch on (IG) Refreshing seat switch RH side off	Below 1 V
a15-1 (SWR) - a15-6 (E)	Engine switch on (IG) Refreshing seat switch RH side on	11 to 14 V
a15-4 (B1) - a15-6 (E)	Engine switch off	Below 1 V
a15-4 (B1) - a15-6 (E)	Engine switch on (IG)	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 a15 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

a15-5 (THR) - Body ground

Engine switch on (IG)

Refreshing seat switch RH side 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 LH 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 ...

Terminals Of Ecu

TERMINALS OF ECU 1. AIR CONDITIONING AMPLIFIER (a) Measure the voltage and resistance according to the value(s) in the table below. Terminal No. (Symbol) Wiring Color ...

Other materials about Toyota 4Runner:

AUTO LSD Indicator Light does not Come ON
DESCRIPTION The AUTO LSD does not operate even if the VSC OFF switch is pressed under the following conditions: The brake system is faulty. The temperature inside the hydraulic brake booster increases and the AUTO LSD operation is suspended. ...

Precaution
PRECAUTION 1. IGNITION SWITCH EXPRESSION HINT: The type of ignition switch used on this model differs according to the specifications of the vehicle. The expressions listed in the table below are used in this section. Expression Ign ...