| Last Modified: 04-05-2023 | 6.11:8.1.0 | Doc ID: RM1000000018KF6 |
| Model Year Start: 2018 | Model: Sienna | Prod Date Range: [11/2017 - ] |
| Title: BRAKE CONTROL / DYNAMIC CONTROL SYSTEMS: VEHICLE STABILITY CONTROL SYSTEM: ABS Warning Light Remains ON; 2018 - 2020 MY Sienna [11/2017 - ] | ||
|
ABS Warning Light Remains ON |
DESCRIPTION
The skid control ECU (brake actuator assembly) is connected to the combination meter assembly via CAN communication.
If any of the following is detected, the ABS warning light remains on:
- The skid control ECU (brake actuator assembly) connectors are disconnected from the skid control ECU (brake actuator assembly).
- There is a malfunction in the skid control ECU (brake actuator assembly) internal circuit.
- There is an open in the harness between the combination meter assembly and the skid control ECU (brake actuator assembly).
- The ABS control system is defective.
HINT:
In some cases, the Techstream cannot be used when the skid control ECU (brake actuator assembly) is abnormal.
WIRING DIAGRAM
CAUTION / NOTICE / HINT
NOTICE:
-
When replacing the skid control ECU (brake actuator assembly), perform zero point calibration and store system information (See page
![2018 - 2020 MY Sienna [11/2017 - ]; BRAKE CONTROL / DYNAMIC CONTROL SYSTEMS: VEHICLE STABILITY CONTROL SYSTEM: CALIBRATION](/t3Portal/stylegraphics/info.gif)
).
- Inspect the fuses for circuits related to this system before performing the following inspection procedure.
PROCEDURE
|
1. |
CHECK CAN COMMUNICATION SYSTEM |
(a) Check if CAN communication system DTCs are output (See page
).
|
Result |
Proceed to |
|---|---|
|
DTCs are not output. |
A |
|
DTCs are output. |
B |
| B |
|
|
|
2. |
CHECK IF BRAKE ACTUATOR ASSEMBLY CONNECTOR IS SECURELY CONNECTED |
(a) Check if the skid control ECU (brake actuator assembly) connector is securely connected.
OK:
The connector is securely connected.
| NG |
|
CONNECT CONNECTOR TO BRAKE ACTUATOR ASSEMBLY CORRECTLY |
|
|
3. |
INSPECT BATTERY POSITIVE TERMINAL |
(a) Check the battery voltage.
Standard Voltage:
11 to 14 V
| NG |
|
|
|
4. |
CHECK HARNESS AND CONNECTOR (IG1 TERMINAL) |
|
(a) Disconnect the skid control ECU (brake actuator assembly) connector. |
|
(b) Turn the ignition switch to ON.
(c) Measure the voltage according to the value(s) in the table below.
Standard Voltage:
|
Tester Connection |
Switch Condition |
Specified Condition |
|---|---|---|
|
A75-12 (IG1) - Body ground |
Ignition switch ON |
10.5 to 16 V |
Text in Illustration
|
*a |
Front view of wire harness connector (to Skid Control ECU (Brake Actuator Assembly)) |
| NG |
|
REPAIR OR REPLACE HARNESS OR CONNECTOR (IG1 CIRCUIT) |
|
|
5. |
CHECK HARNESS AND CONNECTOR (GND1 TERMINAL) |
|
(a) Turn the ignition switch off. |
|
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
A75-25 (GND1) - Body ground |
Always |
Below 1 Ω |
Text in Illustration
|
*a |
Front view of wire harness connector (to Skid Control ECU (Brake Actuator Assembly)) |
| NG |
|
REPAIR OR REPLACE HARNESS OR CONNECTOR (GND1 CIRCUIT) |
|
|
6. |
READ VALUE USING TECHSTREAM (ABS WARNING LIGHT) |
(a) Reconnect the A75 skid control ECU (brake actuator assembly) connector.
(b) Connect the Techstream to the DLC3.
(c) Turn the ignition switch to ON.
(d) Turn the Techstream on.
(e) Select the Data List using the Techstream (See page
).
ABS/VSC/TRAC
|
Tester Display |
Measurement Item/Range |
Normal Condition |
Diagnostic Note |
|---|---|---|---|
|
ABS Warning Light |
ABS warning light / ON or OFF |
ON: Warning light on OFF: Warning light off |
- |
(f) Check the Techstream display condition of the ABS warning light.
|
Result |
Proceed to |
|---|---|
|
Display of the Data List remains ON. |
A |
|
Display of the Data List remains OFF. |
B |
HINT:
If troubleshooting has been carried out according to Problem Symptoms Table, refer back to the table and proceed to the next step before replacing parts (See page
).
| A |
|
| B |
|
|
|