Toyota Tacoma (2015-2018) Service Manual: 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 millimeter wave radar sensor assembly connector. |
|
(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 |
|---|---|---|
|
M8-8 (IGB) - Body ground |
Ignition switch ON |
11 to 14 V |
(d) Turn the ignition switch off.
(e) Connect the millimeter wave radar sensor assembly connector.
| NG | .gif) |
GO TO STEP 4 |
|
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|
2. |
CHECK HARNESS AND CONNECTOR (MILLIMETER WAVE RADAR SENSOR ASSEMBLY - BODY GROUND) |
|
(a) Disconnect the millimeter wave radar sensor assembly connector. |
|
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
M8-1 (SGND) - Body ground |
Always |
Below 1 Ω |
(c) Connect the millimeter wave radar sensor assembly connector.
| OK | |
PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE |
|
|
3. |
CHECK MILLIMETER WAVE RADAR WIRE |
(a) Disconnect the M8 millimeter wave radar sensor assembly connector.
(b) Disconnect the EP1 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 |
|---|---|---|
|
M8-1 (SGND) - EP1-1 |
Always |
Below 1 Ω |
(d) Connect the M8 millimeter wave radar sensor assembly connector.
(e) Connect the EP1 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 M8 millimeter wave radar sensor assembly connector.
(b) Disconnect the EP1 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 |
|---|---|---|
|
M8-8 (IGB) - EP1-8 |
Always |
Below 1 Ω |
|
EP1-8 - EP1-1 |
Always |
10 kΩ or higher |
(d) Connect the M8 millimeter wave radar assembly connector.
(e) Connect the EP1 millimeter wave radar sensor wire connector.
| OK | |
REPAIR OR REPLACE HARNESS OR CONNECTOR (POWER SOURCE CIRCUIT) |
| NG | |
REPAIR MILLIMETER WAVE RADAR WIRE |
Front Radar Sensor (C1A10)
DESCRIPTION
When an internal malfunction is detected in the millimeter wave radar sensor
assembly, DTC C1A10 is stored.
DTC No.
Detection Item
DTC Detection Condit ...
Pre-collision System Warning Buzzer
Components
COMPONENTS
ILLUSTRATION
*1
SKID CONTROL BUZZER
-
-
Inspection
INSPECTION
PROCEDURE
1. INSPECT SKID CONTROL BUZZER
...
Other materials:
Removal
REMOVAL
PROCEDURE
1. PRECAUTION
NOTICE:
After turning the ignition switch off, waiting time may be required before disconnecting
the cable from the negative (-) battery terminal.
Therefore, make sure to read the disconnecting the cable from the negative (-)
battery terminal notices before p ...
Diagnostic Trouble Code Chart
DIAGNOSTIC TROUBLE CODE CHART
LANE DEPARTURE ALERT SYSTEM
DTC No.
Detection Item
Link
C1A47
Steering Angle Sensor
C1AA0
Front Camera Module Circuit
C1AA1
F ...
Removal
REMOVAL
PROCEDURE
1. PRECAUTION
NOTICE:
After turning the ignition switch off, waiting time may be required before disconnecting
the cable from the negative (-) battery terminal. Therefore, make sure to read the
disconnecting the cable from the negative (-) battery terminal notices before pr ...
