Toyota Tundra Service Manual: Terminals Of Ecu

TERMINALS OF ECU

MULTIPLEX TILT AND TELESCOPIC ECU

*a

Component without harness connected

(Multiplex Tilt and Telescopic ECU)

-

-

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

Terminal No. (Symbol)

Wiring Color

Terminal Description

Condition

Specified Condition

J174-1 (GND) - Body ground

W-B - Body ground

ECU ground

Always

Below 1 Ω

J174-2 (+B) - J174-1 (GND)

SB - W-B

Motor power source

Always

11 to 14 V

J174-3 (CANP) - J174-11 (CANN)

P - W

CAN communication

Ignition switch off

54 to 69 Ω

J174-4 (E1) - Body ground

BR - Body ground

Tilt sensor ground

Always

Below 1 Ω

J174-5 (VC) - J174-18 (MSW)

Y - GR

Tilt and telescopic switch signal

Ignition switch ON

4.9 to 5.1 V

J174-6 (TEM+) - J174-1 (GND)

G - W-B

Telescopic motor output

  • Ignition switch ON
  • Steering column contracting

11 to 14 V

Telescopic motor not operating

Below 1 V

J174-7 (TIM+) - J174-1 (GND)

B - W-B

Tilt motor output

  • Ignition switch ON
  • Steering wheel tilting up

11 to 14 V

Tilt motor not operating

Below 1 V

J174-8 (GND2) - Body ground

W-B - Body ground

ECU ground

Always

Below 1 Ω

J174-9 (ECUB) - J174-1 (GND)

BE - W-B

ECU power source

Always

11 to 14 V

J174-10 (IG) - J174-1 (GND)

L - W-B

IG signal / IG power source

Ignition switch ON

11 to 14 V

Ignition switch off

Below 1 V

J174-13 (VCI) - J174-4 (E1)

SB - BR

Tilt sensor power source

Ignition switch ON

8 to 14 V

J174-14 (VCE) - J174-17 (E2)

R - BR

Telescopic sensor power source

Ignition switch ON

8 to 14 V

J174-15 (TES) - J174-17 (E2)

L - BR

Telescopic sensor signal

Telescopic motor operating

Pulse generation

HI: 8 to 14 V

LOW: Below 1 V

J174-16 (TIS) - J174-4 (E1)

G - BR

Tilt sensor signal

Tilt motor operating

Pulse generation

HI: 8 to 14 V

LOW: Below 1 V

J174-17 (E2) - Body ground

BR - Body ground

Telescopic sensor ground

Always

Below 1 Ω

J174-19 (TEM-) - J174-1 (GND)

P - W-B

Telescopic motor output

  • Ignition switch ON
  • Steering column extending

11 to 14 V

Telescopic motor not operating

Below 1 V

J174-20 (TIM-) - J174-1 (GND)

R - W-B

Tilt motor output

  • Ignition switch ON
  • Steering wheel tilting down

11 to 14 V

Tilt motor not operating

Below 1 V

    System Diagram

    Tilt and Telescopic Manual Switch Circuit

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