Toyota Tacoma manuals

Toyota Tacoma 2015-2018 Service Manual: Terminals Of Ecu

TERMINALS OF ECU

1. CLEARANCE WARNING ECU ASSEMBLY

(a) Disconnect the C30 connector from the clearance warning ECU assembly.

(a) Disconnect the C30 connector from the clearance warning ECU assembly.

(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

C30-9 (CLSW) - C30-30 (E)

Y - W-B

Back sonar or clearance sonar switch assembly power source signal

Ignition switch ON, back sonar or clearance sonar switch assembly on

11 to 14 V

C30-9 (CLSW) - C30-30 (E)

Y - W-B

Back sonar or clearance sonar switch assembly power source signal

Ignition switch ON, back sonar or clearance sonar switch assembly off

Below 1 V

C30-1 (IG) - C30-30 (E)

P - W-B

IG power source signal

Ignition switch off

Below 1 V

Ignition switch ON

11 to 14 V

C30-30 (E) - Body ground

W-B - Body ground

Ground

Always

Below 1 Ω

(c) Reconnect the C30 connector to the clearance warning ECU assembly.

(d) Measure the voltage and check for pulses according to the value(s) in the table below.

Terminal No. (Symbol)

Wiring Color

Terminal Description

Condition

Specified Condition

C30-22 (BOR) - C30-30 (E)

BE - W-B

Power source for rear sensor circuit

Ignition switch off

Below 1 V

Ignition switch ON, back sonar or clearance sonar switch assembly on

7.2 to 8.8 V

C30-13 (ER) - C30-30 (E)

R - W-B

Clearance warning buzzer signal

Buzzer sounding

Pulse generation

(See waveform 1)

C30-23 (E1) - C30-30 (E)

B - W-B

Ground for rear clearance sonar

Always

Below 1 V

C30-24 (SOR) - C30-30 (E)

V - W-B

Rear sensor communication signal (Rear clearance sonar sensor)

Ignition switch ON, back sonar or clearance sonar switch assembly on, shift lever in R

Pulse generation

(See waveform 2)

(e) Using an oscilloscope, check waveform 1.

(1) Waveform 1 (Reference)

Item

Content

Terminal No. (Symbol)

C30-13 (ER) - C30-30 (E)

Tool Setting

2 V/DIV., 500 μsec./DIV.

Vehicle Condition

When sonar detects obstacle (buzzer sounds)

Buzzer volume

M2 (Medium volume)

HINT:

The amplitude of the waveform changes according to the set volume.

(f) Using an oscilloscope, check waveform 2.

(1) Waveform 2 (Reference)

Item

Content

Terminal No. (Symbol)

C30-24 (SOR) - C30-30 (E)

Tool Setting

5 V/DIV., 1 msec./DIV.

Condition

Ignition switch ON, back sonar or clearance sonar switch assembly on, shift lever in R

HINT:

The waveforms for CH1 and CH2 are same.

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