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.
DTC Code |
DTC Detection Condition |
Trouble Area |
---|---|---|
C1253 |
There is a motor system circuit (motor input circuit) malfunction. |
|
WIRING DIAGRAM
CAUTION / NOTICE / HINT
NOTICE:
PROCEDURE
1. |
PERFORM ACTIVE TEST USING TECHSTREAM (MOTOR RELAY) |
(a) Turn the ignition switch off.
(b) Connect the Techstream to the DLC3.
(c) Turn the ignition switch to ON.
(d) Turn the Techstream on.
(e) Start the engine.
(f) Enter the following menus: Chassis / ABS/VSC/TRAC / Active Test.
ABS/VSC/TRAC
Tester Display |
Test Part |
Control Range |
Diagnostic Note |
---|---|---|---|
Motor Relay |
Motor relay |
Relay ON/OFF |
An operating sound of the motor can be heard. |
(g) Check the operating sound of the motor individually when operating it with the Techstream.
OK:
An operating 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 off.
(c) Depress the brake pedal more than 40 times.
(d) Turn the ignition switch to ON.
(e) Wait until the pump motor stops.
(f) Depress the brake pedal several times until the pump motor turns on. (Procedure A)
(g) Wait until the pump stops. (Procedure B)
(h) Repeat the above steps (procedure A and B) 3 more times.
(i) Check if the same DTC is output (See page
).
HINT:
Reinstall the sensors, connectors, etc. and restore the previous vehicle conditions before rechecking for DTCs.
Result
Result |
Proceed to |
---|---|
DTC is output |
A |
DTC is not output |
B |
A | ![]() |
REPLACE MASTER CYLINDER SOLENOID |
B | ![]() |
USE SIMULATION METHOD TO CHECK |
3. |
CHECK TERMINAL VOLTAGE (+BM1, +BM2) |
(a) Disconnect the A6 and A7 skid control ECU connectors.
(b) Measure the voltage according to the value(s) in the table below. Standard Voltage:
|
|
NG | ![]() |
REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
4. |
CHECK HARNESS AND CONNECTOR (GND1, GND2 AND GND3 TERMINAL) |
NG | ![]() |
REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
5. |
RECONFIRM DTC |
(a) Clear the DTCs (See page ).
(b) Turn the ignition switch off.
(c) Depress the brake pedal more than 40 times.
(d) Turn the ignition switch to ON.
(e) Wait until the pump motor stops.
(f) Depress the brake pedal several times until the pump motor turns on. (Procedure A)
(g) Wait until the pump stops. (Procedure B)
(h) Repeat the above steps (procedure A and B) 3 more times.
(i) Check if the same DTC is output (See page
).
HINT:
Reinstall the sensors, connectors, etc. and restore the previous vehicle conditions before rechecking for DTCs.
Result
Result |
Proceed to |
---|---|
DTC is output |
A |
DTC is not output |
B |
A | ![]() |
REPLACE MASTER CYLINDER SOLENOID |
B | ![]() |
USE SIMULATION METHOD TO CHECK |
Rear Occupant Classification Sensor LH Collision Detection (B1787)
DESCRIPTION
DTC B1787 is stored when the occupant classification ECU receives a collision
detection signal, which is sent by the rear occupant classification sensor LH when
an accident occurs.
DTC B1787 is also stored when the separate type front seat cu ...
Front Passenger Side Power Window does not Operate with Front Passenger Side
Power Window Switch
DESCRIPTION
If the manual up/down function does not operate, there may be a malfunction
in the power window regulator switch, front power window regulator motor,
harness or connector.
WIRING DIAGRAM
CAUTION / NOTICE / HINT
NOTICE:
I ...