- Vehicle stability control system
- Brake actuator (skid control ECU)
- Driving support ECU
| Last Modified: 04-05-2023 | 6.11:8.1.0 | Doc ID: RM100000000VJTG |
| Model Year Start: 2016 | Model: Sienna | Prod Date Range: [12/2015 - 11/2017] |
| Title: PRE-COLLISION: PRE-COLLISION SYSTEM: C1A4B; Stop Light Relay Circuit; 2016 - 2017 MY Sienna [12/2015 - 11/2017] | ||
|
DTC |
C1A4B |
Stop Light Relay Circuit |
DESCRIPTION
The stop light switch assembly outputs a brake pedal operation signal to the driving support ECU. Based on the signal, the driving support ECU cancels cruise control.
|
DTC No. |
DTC Detection Condition |
Trouble Area |
|---|---|---|
|
C1A4B |
When the ignition switch is ON, a stop light relay malfunction signal is received from the skid control ECU. |
|
CAUTION / NOTICE / HINT
NOTICE:
When this DTC is output, malfunction in the lighting system is suspected. Check if the lighting system is functioning normally (See page
![2016 - 2020 MY Sienna [12/2015 - ]; LIGHTING (EXT): LIGHTING SYSTEM: HOW TO PROCEED WITH TROUBLESHOOTING](/t3Portal/stylegraphics/info.gif)
).
HINT:
This circuit uses CAN communication. Therefore, be sure to check that the CAN communication system is normal before performing inspection (See page
).
PROCEDURE
|
1. |
CHECK FOR DTC (VEHICLE STABILITY CONTROL SYSTEM) |
(a) Check DTCs for the vehicle stability control system (See page
).
OK:
Vehicle stability control system DTC is not output.
| NG |
|
|
|
2. |
REPLACE BRAKE ACTUATOR (SKID CONTROL ECU) |
(a) Replace the brake actuator (skid control ECU) (See page
).
|
|
3. |
CHECK FOR DTC (PRE-COLLISION 2 SYSTEM) |
(a) Using the Techstream, enter the following menus: Body Electrical / Pre-Collision 2 / Trouble Codes.
(b) Clear the DTCs (See page
).
(c) Check for DTCs (See page
).
OK:
DTC U1A4B is not output.
| OK |
|
END |
| NG |
|
|
|