ABS Warning Light Remains ON: Procedure

1. Check if a CAN communication system DTC is output (w/ Smart Key System:, refer to DIAGNOSIS SYSTEM , w/o Smart Key System:, refer to DIAGNOSIS SYSTEM ).

   Result

   Result	Proceed to
   DTC is not output	A
   DTC is output (w/ Smart Key System)	B
   DTC is output (w/o Smart Key System)	C

B → See step   8 

C → See step   10 

A: Go to next step 

1. Check if the skid control ECU connector is securely connected.

   OK

   The connector is securely connected.

NG → CONNECT CONNECTOR TO ECU CORRECTLY 

OK: Go to next step 

1. Check the auxiliary battery voltage.

   Standard Voltage

   11 to 14 V

NG → CHARGE OR REPLACE AUXILIARY BATTERY 

OK: Go to next step 

1. Disconnect the A44 skid control ECU connector.
   Fig 1: Identifying Skid Control ECU Connector Terminals

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Turn the ignition switch to ON.
3. Measure the voltage according to the value(s) in the table below.

   Standard Voltage

   Tester Connection	Switch Condition	Specified Condition
   A44-2 (IG1) - Body ground	Ignition switch ON	11 to 14 V

   TEXT IN ILLUSTRATION
   
   

   *1	Front view of wire harness connector (to Skid Control ECU)

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR (IG1 CIRCUIT) 

OK: Go to next step 

1. Turn the ignition switch off.
   Fig 2: Identifying Skid Control ECU Connector Terminals

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
   TEXT IN ILLUSTRATION
   
   

   *1

   Front view of wire harness connector (to Skid Control ECU)

   -

   -

2. Disconnect the A45, A46 and A47 skid control ECU connectors.
3. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   A46-1 (GND) - Body ground	Always	Below 1 Ω
   A44-3 (GND2) - Body ground	Always	Below 1 Ω
   A44-1 (GND3) - Body ground	Always	Below 1 Ω
   A47-3 (GND4) - Body ground	Always	Below 1 Ω
   A47-1 (GND5) - Body ground	Always	Below 1 Ω
   A45-3 (GND6) - Body ground	Always	Below 1 Ω

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR (GND CIRCUIT) 

OK: Go to next step 

1. Reconnect the skid control ECU connectors.
2. Perform the Active Test of the combination meter (meter CPU) using the Techstream, refer to DATA LIST / ACTIVE TEST .
3. Check the combination meter.

   OK

   The ABS warning light turns on and off in accordance with the Techstream operation.

   HINT: 

   If troubleshooting has been carried out according to Problem Symptoms Table, refer back to the table and proceed to the next suspected area before replacing the part, refer to PROBLEM SYMPTOMS TABLE .

NG → See step   9 

OK → See step   7