DTC C1315/31: SMC1 Changeover Solenoid Malfunction; DTC C1316/32: SMC2 Changeover Solenoid Malfunction; DTC C1352/21: Front Increasing Pressure Solenoid RH Malfunction; DTC C1353/23: Front Increasing Pressure Solenoid LH Malfunction; DTC C1354/25: Rear Increasing Pressure Solenoid RH Malfunction; DTC C1355/27: Rear Increasing Pressure Solenoid LH Malfunction; DTC C1356/22: Front Decreasing Pressure Solenoid RH Malfunction; DTC C1357/24: Front Decreasing Pressure Solenoid LH Malfunction; DTC C1358/26: Rear Decreasing Pressure Solenoid RH Malfunction; DTC C1359/28: Rear Decreasing Pressure Solenoid LH Malfunction [03/2017 - 09/2018]: Procedure

INSPECT BRAKE ACTUATOR ASSEMBLY

Make sure that there is no looseness at the locking part and the connecting part of the connector.

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Component without harness connected
(Brake Actuator Assembly)

Disconnect the A7 brake actuator assembly connector.

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

HINT:

Check the brake actuator assembly when it is cooled down.

Standard Resistance

Tester Connection	Condition	Specified Condition
37 (SMC1) - 36 (BS1)	Always	15.3 to 17.3 Ω
37 (SMC1) or 36 (BS1) - Body ground	Always	10 kΩ or higher
19 (SMC2) - 20 (BS2)	Always	15.3 to 17.3 Ω
19 (SMC2) or 20 (BS2) - Body ground	Always	10 kΩ or higher
44 (FRA+) - 43 (FRA-)	Always	3.6 to 4.2 Ω
44 (FRA+) or 43 (FRA-) - Body ground	Always	10 kΩ or higher
35 (FLA+) - 38 (FLA-)	Always	3.6 to 4.2 Ω
35 (FLA+) or 38 (FLA-) - Body ground	Always	10 kΩ or higher
39 (RRA+) - 40 (RRA-)	Always	3.6 to 4.2 Ω
39 (RRA+) or 40 (RRA-) - Body ground	Always	10 kΩ or higher
41 (RLA+) - 42 (RLA-)	Always	3.6 to 4.2 Ω
41 (RLA+) or 42 (RLA-) - Body ground	Always	10 kΩ or higher
28 (FRR+) - 27 (FRR-)	Always	3.6 to 4.2 Ω
28 (FRR+) or 27 (FRR-) - Body ground	Always	10 kΩ or higher
21 (FLR+) - 22 (FLR-)	Always	3.6 to 4.2 Ω
21 (FLR+) or 22 (FLR-) - Body ground	Always	10 kΩ or higher
23 (RRR+) - 24 (RRR-)	Always	4.4 to 5.0 Ω
23 (RRR+) or 24 (RRR-) - Body ground	Always	10 kΩ or higher
25 (RLR+) - 26 (RLR-)	Always	4.4 to 5.0 Ω
25 (RLR+) or 26 (RLR-) - Body ground	Always	10 kΩ or higher

Result

Proceed to
OK
NG

Result:

REPLACE BRAKE ACTUATOR ASSEMBLY. Refer to REMOVAL [03/2017 - 05/2023]

Result:

See step 2

CHECK HARNESS AND CONNECTOR (SKID CONTROL ECU ASSEMBLY - BRAKE ACTUATOR ASSEMBLY)

Make sure that there is no looseness at the locking part and the connecting part of the connectors.
Disconnect the A11 and A8 skid control ECU assembly connectors.

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

Standard Resistance

Tester Connection	Condition	Specified Condition
A8-26 (RLA+) - A7-41 (RLA+)	Always	Below 1 Ω
A8-26 (RLA+) or A7-41 (RLA+) - Body ground	Always	10 kΩ or higher
A8-27 (RLA-) - A7-42 (RLA-)	Always	Below 1 Ω
A8-27 (RLA-) or A7-42 (RLA-) - Body ground	Always	10 kΩ or higher
A11-26 (RRA+) - A7-39 (RRA+)	Always	Below 1 Ω
A11-26 (RRA+) or A7-39 (RRA+) - Body ground	Always	10 kΩ or higher
A11-27 (RRA-) - A7-40 (RRA-)	Always	Below 1 Ω
A11-27 (RRA-) or A7-40 (RRA-) - Body ground	Always	10 kΩ or higher
A11-19 (FLA+) - A7-35 (FLA+)	Always	Below 1 Ω
A11-19 (FLA+) or A7-35 (FLA+) - Body ground	Always	10 kΩ or higher
A11-18 (FLA-) - A7-38 (FLA-)	Always	Below 1 Ω
A11-18 (FLA-) or A7-38 (FLA-) - Body ground	Always	10 kΩ or higher
A8-34 (FRA+) - A7-44 (FRA+)	Always	Below 1 Ω
A8-34 (FRA+) or A7-44 (FRA+) - Body ground	Always	10 kΩ or higher
A8-33 (FRA-) - A7-43 (FRA-)	Always	Below 1 Ω
A8-33 (FRA-) or A7-43 (FRA-) - Body ground	Always	10 kΩ or higher
A11-8 (FLR+) - A7-21 (FLR+)	Always	Below 1 Ω
A11-8 (FLR+) or A7-21 (FLR+) - Body ground	Always	10 kΩ or higher
A11-9 (FLR-) - A7-22 (FLR-)	Always	Below 1 Ω
A11-9 (FLR-) or A7-22 (FLR-) - Body ground	Always	10 kΩ or higher
A8-6 (FRR+) - A7-28 (FRR+)	Always	Below 1 Ω
A8-6 (FRR+) or A7-28 (FRR+) - Body ground	Always	10 kΩ or higher
A8-7 (FRR-) - A7-27 (FRR-)	Always	Below 1 Ω
A8-7 (FRR-) or A7-27 (FRR-) - Body ground	Always	10 kΩ or higher
A8-17 (RLR+) - A7-25 (RLR+)	Always	Below 1 Ω
A8-17 (RLR+) or A7-25 (RLR+) - Body ground	Always	10 kΩ or higher
A8-16 (RLR-) - A7-26 (RLR-)	Always	Below 1 Ω
A8-16 (RLR-) or A7-26 (RLR-) - Body ground	Always	10 kΩ or higher
A11-2 (RRR+) - A7-23 (RRR+)	Always	Below 1 Ω
A11-2 (RRR+) or A7-23 (RRR+) - Body ground	Always	10 kΩ or higher
A11-1 (RRR-) - A7-24 (RRR-)	Always	Below 1 Ω
A11-1 (RRR-) or A7-24 (RRR-) - Body ground	Always	10 kΩ or higher
A8-4 (SMC1) - A7-37 (SMC1)	Always	Below 1 Ω
A8-4 (SMC1) or A7-37 (SMC1) - Body ground	Always	10 kΩ or higher
A8-3 (BS01) - A7-36 (BS1)	Always	Below 1 Ω
A8-3 (BS01) or A7-36 (BS1) - Body ground	Always	10 kΩ or higher
A11-4 (SMC2) - A7-19 (SMC2)	Always	Below 1 Ω
A11-4 (SMC2) or A7-19 (SMC2) - Body ground	Always	10 kΩ or higher
A11-7 (BS02) - A7-20 (BS2)	Always	Below 1 Ω
A11-7 (BS02) or A7-20 (BS2) - Body ground	Always	10 kΩ or higher

Result

Proceed to
OK
NG

Result:

REPAIR OR REPLACE HARNESS OR CONNECTOR

Result:

See step 3

RECONFIRM DTC

Reconnect the A11 and A8 skid control ECU assembly connectors.
Reconnect the A7 brake actuator assembly connector.
Clear the DTCs.
Refer to DTC CHECK / CLEAR [03/2017 - 09/2018]

Chassis > ABS/VSC/TRAC > Clear DTCs
Turn the engine switch off.
Turn the engine switch on (IG).

Check if the same DTC is output.

Refer to DTC CHECK / CLEAR [03/2017 - 09/2018]

Chassis > ABS/VSC/TRAC > Trouble Codes

Result

Result	Proceed to
DTCs C1315/31, C1316/32, C1352/21, C1353/23, C1354/25, C1355/27, C1356/ 22, C1357/24, C1358/26 and C1359/28 are not output.	A
DTCs C1315/31, C1316/32, C1352/21, C1353/23, C1354/25, C1355/27, C1356/ 22, C1357/24, C1358/26 and/or C1359/28 are output.	B

Result:

USE SIMULATION METHOD TO CHECK. Refer to HOW TO PROCEED WITH TROUBLESHOOTING [03/2017 - 04/2020]

Result:

REPLACE SKID CONTROL ECU ASSEMBLY. Refer to REMOVAL [03/2017 - 05/2023]