Toyota 4Runner manuals

Toyota 4Runner: Terminals Of Ecu

TERMINALS OF ECU

1. CHECK FRONT POWER SEAT SWITCH LH


(a) Disconnect the b18 and b19 connectors from the front power seat switch LH.

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

Terminal No. (Symbol)

Wiring Color

Terminal Description

Condition

Specified Condition

b18-2 (GND1) - Body ground

W-B - Body ground

Ground

Always

Below 1 Ω

b18-7 (+B1) - b18-2 (GND1)

W - W-B

Power source

Always

11 to 14 V

b19-12 (SYSB) - b18-2 (GND1)

P - W-B

System power source

Always

11 to 14 V

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

(c) Reconnect the b18 and b19 switch connectors.

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

Terminal No. (Symbol)

Wiring Color

Terminal Description

Condition

Specified Condition

b18-3 (SLD+) - b18-2 (GND1)

L - W-B

Sliding motor signal (forward)

Slide switch off

Below 1 V

Slide switch on (Forward)

11 to 14 V

b18-4 (SLD-) - b18-2 (GND1)

GR - W-B

Sliding motor signal (rearward)

Slide switch off

Below 1 V

Slide switch on (Rearward)

11 to 14 V

b18-5 (FRV-) - b18-2 (GND1)

R - W-B

Front vertical motor signal (downward)

Front vertical switch off

Below 1 V

Front vertical switch on (Downward)

11 to 14 V

b18-6 (+B2) - b18-1 (GND2)

SB - W-B

Power source

Always

11 to 14 V

b18-8 (FRV+) - b18-2 (GND1)

B - W-B

Front vertical motor signal (upward)

Front vertical switch off

Below 1 V

Front vertical switch on (Upward)

11 to 14 V

b18-9 (RCL+) - b18-2 (GND1)

P - W-B

Reclining motor signal (forward)

Reclining switch off

Below 1 V

Reclining switch on (Forward)

11 to 14 V

b18-11 (RCL-) - b18-2 (GND1)

LG - W-B

Reclining motor signal (rearward)

Reclining switch off

Below 1 V

Reclining switch on (Rearward)

11 to 14 V

b18-10 (LFT+) - b18-2 (GND1)

V - W-B

Lifter motor signal (upward)

Lifter switch off

Below 1 V

Lifter switch on (Upward)

11 to 14 V

b18-12 (LFT-) - b18-2 (GND1)

G - W-B

Lifter motor signal (downward)

Lifter switch off

Below 1 V

Lifter switch on (Downward)

11 to 14 V

b19-1 (SGND) - b18-2 (GND1)

BR - W-B

Ground

Always

Below 1 Ω

b19-3 (SSFV) - b19-1 (SGND)

R - BR

Front vertical position signal

Front vertical function operating

4.5 to 4.8 V

b19-4 (SSRL) - b19-1 (SGND)

P - BR

Lifter position signal

Lifter function operating

4.5 to 4.8 V

b19-5 (SSRS) - b19-1 (SGND)

G- BR

Slide position signal

Slide function operating

4.5 to 4.8 V

b19-11 (SSRR) - b19-1 (SGND)

V - BR

Reclining position signal

Reclining function operating

4.5 to 4.8 V

If the result is not as specified, the front power seat switch LH may have a malfunction.

2. CHECK DRIVER SIDE JUNCTION BLOCK ASSEMBLY AND MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)


(a) Remove the main body ECU (multiplex network body ECU) (See page ).


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

Terminal No. (Symbol)

Wiring Color

Terminal Description

Condition

Specified Condition

A-30 (BECU) - Body ground

-

Power source

Always

11 to 14 V

A-32 (IG) - Body ground

-

Power source (IG)

Engine switch on (IG)

11 to 14 V

Engine switch off

Below 1 V

A-11 (GND1) - Body ground

-

Ground

Always

Below 1 Ω

F10-3 (GND2) - Body ground

W-B - Body ground

Ground

Always

Below 1 Ω

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

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