Inspection Procedure

1. Check the information code from the "FREEZE FRAME DATA" memorized when the DTC (C1377/43) is stored (see FREEZE FRAME DATA  ).

   Result 

   RESULT CHART
   
   

   Result	Proceed To
   Information codes (109 and 110) are output	A
   Information codes (101,102,105,106 and 108) are output	B
   Information code (103) is output	C

B: REPLACE BRAKE CONTROL POWER SUPPLY  (See REMOVAL  )

C: Go to step  6

A: Go to Next Step 

1. Remove the ABS MAIN4 fuse from the luggage room relay block (junction block).
2. Measure the resistance of the fuse.

   Standard Resistance 

   TESTER CONNECTION SPECIFIED CONDITION CHART
   
   

   Tester Connection	Condition	Specified Condition
   ABS MAIN4 fuse	Always	Below 1 Ω

NG: REPLACE FUSE 

OK: Go to Next Step 

1. Disconnect the S49 power supply connector.
2. Measure the voltage according to the value(s) in the table below.

   Standard Voltage 

   TESTER CONNECTION SPECIFIED CONDITION CHART
   
   

   Tester Connection	Condition	Specified Condition
   S49-8 (+BC) - Body ground	Always	11 to 14 V

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

   Standard Resistance 

   TESTER CONNECTION SPECIFIED CONDITION CHART
   
   

   Tester Connection	Condition	Specified Condition
   S49-14 (GND) - Body ground	Always	Below 1 Ω

   Fig 1: Identifying S49 Power Supply Connector Terminals +BC Or GND

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR (+BC OR GND CIRCUIT) 

OK: Go to Next Step 

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

   HINT:

   Perform inspection while the brake is not operated.

   Standard Voltage 

   TESTER CONNECTION SPECIFIED CONDITION CHART
   
   

   Tester Connection	Condition	Specified Condition
   S49-1 (OUT1) - Body ground	Always	11 to 14 V
   S49-7 (OUT2) - Body ground	Always	11 to 14 V

   Fig 2: Identifying S49 Power Supply Connector Terminals CTY+ And OUT

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

OK: Go to step  8

NG: Go to Next Step 

1. Disconnect the A19 and A21 ECU connectors.
2. Disconnect the S49 power supply connector.
3. Measure the resistance according to the value(s) in the table below.

   Standard Resistance 

   TESTER CONNECTION SPECIFIED CONDITION CHART
   
   

   Tester Connection	Condition	Specified Condition
   A19-38 (CBI1) - S49-1 (OUT1)	Always	Below 1 Ω
   A21-40 (CBI2) - S49-7 (OUT2)	Always	Below 1 Ω
   A19-38 (CBI1) - Body ground	Always	10 kΩ or higher
   A21-40 (CBI2) - Body ground	Always	10 kΩ or higher

   Fig 3: Identifying A19, A21 And S49 Connector Terminals

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

OK: Go to step  8

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

1. Check the battery voltage.

   Standard Voltage: 11 to 14 V 

NG: INSPECT CHARGING SYSTEM  (See ON-VEHICLE INSPECTION )

OK: Go to Next Step 

1. Disconnect the S49 power supply connector.
2. Measure the voltage according to the value(s) in the table below.

   Standard Voltage 

   TESTER CONNECTION SPECIFIED CONDITION CHART
   
   

   Tester Connection	Condition	Specified Condition
   S49-8 (+BC) - Body ground	Always	11 to 14 V

   Fig 4: Identifying S49 Power Supply Connector Terminals +BC

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR (+BC CIRCUIT) 

OK: Go to Next Step 

1. Clear the DTC (see DTC CHECK / CLEAR  ).
2. Turn the engine switch on (IG).
3. Check if the same DTC is recorded (see DTC CHECK / CLEAR  ).

   HINT:

   Reinstall the sensors, connectors, etc. and restore the vehicle to its prior condition before rechecking for DTCs.

   Result 

   RESULT CHART
   
   

   Result	Proceed To
   DTC (C1377/43) is not output	A
   DTC (C1377/43) is output	B

B: REPLACE BRAKE CONTROL POWER SUPPLY  (See REMOVAL  )

A: END