DESCRIPTION
The motor relay (semiconductor relay) is built into the master cylinder solenoid and drives the pump motor based on a signal from the skid control ECU (master cylinder solenoid).
DTC No. |
DTC Detecting Condition |
Trouble Areas |
---|---|---|
C1253 |
Open in motor system circuit (motor input circuit) |
|
WIRING DIAGRAM
CAUTION / NOTICE / HINT
NOTICE:
HINT:
Start the inspection from step 1 when using Techstream and start from step 3 when not using Techstream.
PROCEDURE
1. |
PERFORM ACTIVE TEST USING TECHSTREAM (MOTOR RELAY) |
(a) Connect Techstream to the DLC3.
(b) Turn the ignition switch to the ON position.
(c) Turn Techstream ON.
(d) Select the Active Test mode on the Techstream.
ABS/VSC/TRAC
Tester Display |
Test Part |
Control Range |
Diagnostic Note |
---|---|---|---|
Motor Relay |
Turns motor relay |
ON / OFF |
Operation of motor can be heard |
(e) Check for operation sound of the motor when it is operated with Techstream.
OK:
The operation sound of the motor can be heard.
NG | ![]() |
GO TO STEP 3 |
|
2. |
RECONFIRM DTC |
(a) Clear the DTCs (See page
).
(b) Turn the ignition switch to OFF.
(c) Depress the brake pedal more than 20 times.
(d) Turn the ignition switch to the ON position.
(e) Wait until the pump motor stops.
(f) Depress the brake pedal several times until the pump motor is turned on.
(g) Wait until the pump stops.
(h) Repeat (f) and (g) three times.
(i) Check if the same DTCs are recorded.
Result |
Proceed to |
---|---|
DTC output |
A |
DTC not output |
B |
A | ![]() |
REPLACE HYDRAULIC BRAKE BOOSTER |
B | ![]() |
END |
3. |
CHECK HARNESS AND CONNECTOR (+BM, +BM2 TERMINAL) |
(a) Disconnect the skid control ECU (master cylinder solenoid) connectors. |
|
(b) Measure the voltage.
Standard Voltage:
Tester Connection |
Specified Condition |
---|---|
S1-2 (+BM1) - Body ground |
10 to 14 V |
S2-2 (+BM2) - Body ground |
10 to 14 V |
(c) Reconnect the skid control ECU (master cylinder solenoid) connectors.
NG | ![]() |
REPAIR OR REPLACE HARNESS OR CONNECTOR (+BM1 AND +BM2 CIRCUIT) |
|
4. |
CHECK HARNESS AND CONNECTOR (SKID CONTROL ECU - BODY GROUND) |
(a) Disconnect the skid control ECU (master cylinder solenoid) connectors. |
|
(b) Measure the resistance.
Standard Resistance:
Tester Connection |
Specified Condition |
---|---|
S1-1 (GND1) - Body ground |
Below 1 Ω |
S1-32 (GND2) - Body ground |
Below 1 Ω |
S2-4 (GND3) - Body ground |
Below 1 Ω |
(c) Reconnect the skid control ECU (master cylinder solenoid) connectors.
NG | ![]() |
REPAIR OR REPLACE HARNESS OR CONNECTOR (GND CIRCUIT) |
|
5. |
RECONFIRM DTC |
(a) Clear the DTCs (See page
).
(b) Turn the ignition switch to OFF.
(c) Depress the brake pedal more than 20 times.
(d) Turn the ignition switch to the ON position.
(e) Wait until the pump motor stops.
(f) Depress the brake pedal several times until the pump motor is turned on.
(g) Wait until the pump stops.
(h) Repeat (f) and (g) three times.
(i) Check if the same DTCs are recorded.
Result |
Proceed to |
---|---|
DTC output |
A |
DTC not output |
B |
A | ![]() |
REPLACE HYDRAULIC BRAKE BOOSTER |
B | ![]() |
END |
On-vehicle Inspection
ON-VEHICLE INSPECTION
PROCEDURE
1. INSPECT SIDE AIRBAG SENSOR ASSEMBLY (for Vehicle not Involved in Collision)
(a) Perform a Diagnostic System Check (See page
).
2. INSPECT SIDE AIRBAG SENSOR ASSEMBLY (for Vehicle Involved in Collision and
Airbag has not Deployed)
CAUTION:
For side airbag ...
Vehicle Information Not Obtained (C1A02)
DESCRIPTION
When a new millimeter wave radar sensor assembly is installed, it receives vehicle
specification information (destination, steering wheel position, 2WD or 4WD, etc.)
from the main body ECU (multiplex network body ECU) and stores the information.
DTC C1A02 is stored when the millime ...
System Description
SYSTEM DESCRIPTION
1. POWER WINDOW CONTROL SYSTEM DESCRIPTION
(a) The power window control system controls the power window operation using
the power window regulator motors. The main controls of this system are the power
window regulator master switch assembly (mounted on the driver door), po ...