Toyota Tundra Service Manual: Terminals Of Ecu

TERMINALS OF ECU

1. CHECK POSITION CONTROL ECU AND SWITCH ASSEMBLY

(a) Disconnect the Z9 and Z10 position control ECU and switch assembly connectors.

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

Terminal No. (Symbols)

Wiring Color

Terminal Description

Condition

Specified Condition

Z9-2 (GND1) - Body ground

W-B - Body ground

Ground

Always

Below 1 Ω

Z9-7 (+B1) - Z9-2 (GND1)

W - W-B

Battery (ECU power source)

Always

11 to 14 V

Z10-12 (SYSB) - Z9-2 (GND1)

LG - W-B

Battery (ECU power source)

Always

11 to 14 V

Z10-10 (DBCL) - Z10-1 (SGND)

P - BR

Front seat inner belt buckle switch signal

Seat belt unfastened

Below 1 Ω

Seat belt fastened

10 kΩ or higher

(c) Reconnect the Z9 and Z10 position control ECU and switch assembly connectors.

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

Terminal No. (Symbols)

Wiring Color

Terminal Description

Condition

Specified Condition

Z9-1 (GND2) - Body ground

W-B - Body ground

Lumbar support adjuster ground

Always

Below 1 Ω

Z9-3 (SLD+) - Z9-2 (GND1)

L - W-B

Sliding motor signal (forward)

Seat moving forward using sliding switch

11 to 14 V

OFF

Below 1 V

Z9-4 (SLD-) - Z9-2 (GND1)

GR - W-B

Sliding motor signal (rearward)

Seat moving rearward using sliding switch

11 to 14 V

OFF

Below 1 V

Z9-5 (FRV-) - Z9-2 (GND1)

R - W-B

Front Vertical motor signal (downward)

Seat cushion front portion downward using front vertical switch

11 to 14 V

OFF

Below 1 V

Z9-6 (+B2) - Z9-1 (GND2)

LG - W-B

Lumbar support adjuster power source

Always

11 to 14 V

Z9-8 (FRV+) - Z9-2 (GND1)

B - W-B

Front vertical motor signal (upward)

Seat cushion front portion upward using front vertical switch

11 to 14 V

OFF

Below 1 V

Z9-9 (RCL+) - Z9-2 (GND1)

LG - W-B

Reclining motor signal (forward)

Seatback moving forward using reclining switch

11 to 14 V

OFF

Below 1 V

Z9-10 (LFT+) - Z9-2 (GND1)

V - W-B

Lift or motor signal (upward)

Seat cushion upward using lifter switch

11 to 14 V

OFF

Below 1 V

Z9-11 (RCL-) - Z9-2 (GND1)

P - W-B

Reclining motor signal (rearward)

Seatback moving rearward using reclining switch

11 to 14 V

OFF

Below 1 V

Z9-12 (LFT-) - Z9-2 (GND1)

Y - W-B

Lift or motor signal (downward)

Seat cushion downward using lifter switch

11 to 14 V

OFF

Below 1 V

Z10-1 (SGND) - Body ground

BR - Body ground

Position sensor ground

Always

Below 1 Ω

Z10-3 (SSFV) - Z10-1 (SGND)

R - BR

Vertical position signal

Front vertical function operation

4.5 to 4.8 V

Z10-4 (SSRL) - Z10-1 (SGND)

P - BR

Lift position signal

Lifter function operation

4.5 to 4.8 V

Z10-5 (SSRS) - Z10-1 (SGND)

G - BR

Slide position signal

Slide function operation

4.5 to 4.8 V

Z10-11 (SSRR) - Z10-1 (SGND)

O - BR

Reclining position signal

Reclining function operation

4.5 to 4.8 V

2. CHECK OUTER MIRROR CONTROL ECU ASSEMBLY

(a) Disconnect the N7 outer mirror control ECU assembly connector.

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

Terminal No. (Symbols)

Wiring Color

Terminal Description

Condition

Specified Condition

N7-3 (B) - N7-9 (GND)

R - W-B

Battery (ECU power source)

Always

11 to 14 V

N7-4 (ACC) - N7-9 (GND)

Y - W-B

Ignition power supply

Ignition switch off

Below 1 V

Ignition switch ACC

11 to 14 V

N7-9 (GND) - Body ground

W-B - Body ground

Ground

Always

Below 1 Ω

(c) Reconnect the N7 outer mirror control ECU assembly connector.

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

Terminal No. (Symbols)

Wiring Color

Terminal Description

Condition

Specified Condition

N8-7 (M2) - N8-10 (MSWE)

BE - V

Memory 2 switch signal

Memory 2 switch off

11 to 14 V

Memory 2 switch on

Below 1 V

N8-8 (M1) - N8-10 (MSWE)

P - V

Memory 1 switch signal

Memory 1 switch off

11 to 14 V

Memory 1 switch on

Below 1 V

N8-9 (MM) - N8-10 (MSWE)

L - V

Memory SET switch signal

Memory SET switch off

11 to 14 V

Memory SET switch on

Below 1 V

    System Diagram

    Wireless Transmitter Memory Function does not Operate

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