Toyota Tundra Service Manual: ECU Power Source Circuit

Toyota Tundra Service Manual / Vehicle Interior / Pre-collision / Pre-collision System / ECU Power Source Circuit

DESCRIPTION

This circuit supplies power to the millimeter wave radar sensor assembly when the ignition switch is ON.

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

Inspect the fuses for circuits related to this system before performing the following inspection procedure.

PROCEDURE

1.

CHECK MILLIMETER WAVE RADAR SENSOR ASSEMBLY (B VOLTAGE)

(a) Disconnect the d1 millimeter wave radar sensor assembly connector.

*a

Front view of wire harness connector

(to Millimeter Wave Radar Sensor Assembly)

(b) Turn the ignition switch to ON.

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

Standard Voltage:

Tester Connection

Condition

Specified Condition

d1-8 (IGB) - Body ground

Ignition switch ON

11 to 14 V

(d) Turn the ignition switch off.

(e) Connect the d1 millimeter wave radar sensor assembly connector.

NG

GO TO STEP 4

OK

2.

CHECK HARNESS AND CONNECTOR (MILLIMETER WAVE RADAR SENSOR ASSEMBLY - BODY GROUND)

(a) Disconnect the d1 millimeter wave radar sensor assembly connector.

*a

Front view of wire harness connector

(to Millimeter Wave Radar Sensor Assembly)

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

d1-1 (SGND) - Body ground

Always

Below 1 Ω

(c) Connect the d1 millimeter wave radar sensor assembly connector.

OK

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE

NG

3.

CHECK MILLIMETER WAVE RADAR WIRE

(a) Disconnect the d1 millimeter wave radar sensor assembly connector.

(b) Disconnect the Ad1 millimeter wave radar wire connector.

(c) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Tester Connection

Condition

Specified Condition

d1-1 (SGND) - Ad1-1

Always

Below 1 Ω

(d) Connect the d1 millimeter wave radar sensor assembly connector.

(e) Connect the Ad1 millimeter wave radar wire connector.

OK

REPAIR OR REPLACE HARNESS OR CONNECTOR
NG

REPAIR MILLIMETER WAVE RADAR WIRE

4.

CHECK MILLIMETER WAVE RADAR WIRE

(a) Disconnect the d1 millimeter wave radar sensor assembly connector.

(b) Disconnect the Ad1 millimeter wave radar wire connector.

(c) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Tester Connection

Condition

Specified Condition

d1-8 (IGB) - Ad1-8

Always

Below 1 Ω

Ad1-8 - Ad1-1

Always

10 kΩ or higher

(d) Connect the d1 millimeter wave radar assembly connector.

(e) Connect the Ad1 millimeter wave radar sensor wire connector.

OK

REPAIR OR REPLACE HARNESS OR CONNECTOR (POWER SOURCE CIRCUIT)
NG

REPAIR MILLIMETER WAVE RADAR WIRE

    Dtc Check / Clear

    Fail-safe Chart

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