Toyota Prius: Center Airbag Sensor Assembly

Toyota Prius (XW60) 2023-2025 Service Manual / Vehicle Interior / Supplemental Restraint Systems / Center Airbag Sensor Assembly

Removal
Installation

Removal

REMOVAL

CAUTION / NOTICE / HINT

The necessary procedures (adjustment, calibration, initialization or registration) that must be performed after parts are removed and installed, or replaced during airbag ECU assembly removal/installation are shown below.

Necessary Procedures After Parts Removed/Installed/Replaced

Replaced Part or Performed Procedure	Necessary Procedure	Effect/Inoperative Function when Necessary Procedure not Performed
*: Even when not replacing the part, it is necessary to perform the specified necessary procedures after installation.
Airbag ECU assembly	ECU configuration	Toyota Prius Vehicle Control History (RoB) are stored
	Update ECU security key	Vehicle Control History (RoB) are stored
	Write the VIN/Toyota Prius Vehicle Identification Number	-
	Switch the specification information	-
	Perform "Calibration"*	DTCs are stored ABS warning light illuminates Brake system warning light (yellow indicator) illuminates Slip indicator light illuminates Electronically controlled brake system disabled or malfunctions
	w/ Occupant Classification System: Zero point calibration (Occupant classification system)	Occupant Classification System Passenger airbag ON/OFF indicator Airbag System (Front passenger side) Seat Belt Warning System (Front passenger)

CAUTION / NOTICE / HINT

HINT:

When the cable is disconnected / reconnected to the auxiliary battery terminal, systems temporarily stop operating. However, each system has a function that completes learning the first time the system is used.

Learning completes when Toyota Prius vehicle is driven

Effect/Inoperative Function when Necessary Procedure not Performed	Necessary Procedure	Link
Front Camera System	Drive the Toyota Prius vehicle straight ahead at 35 km/h (22 mph) or more for 5 seconds or more.

Learning completes when vehicle is operated normally

Effect/Inoperative Function when Necessary Procedure not Performed	Necessary Procedure	Link
1: w/o Power Back Door System 2: w/ Power Back Door System
Power Door Lock Control System*1 Back door opener	Perform door unlock operation with door control switch or electrical key transmitter sub-assembly switch.
Power Back Door System*2	Reset back door close position
Air Conditioning System	for HEV Model: After the ignition switch is turned to ON, the servo motor standard position is recognized. for PHEV Model: After the ignition switch is turned to ON, the servo motor and expansion valve standard position is recognized.	-

CAUTION / NOTICE / HINT

COMPONENTS (REMOVAL)

Procedure		Part Name Code
1	PRECAUTION	-		-	-
2	DISCONNECT CABLE FROM NEGATIVE AUXILIARY BATTERY TERMINAL	-		-	-
3	NO. 1 INSTRUMENT PANEL UNDER COVER SUB-ASSEMBLY	55606	-	-	-
4	FRONT NO. 1 CONSOLE BOX INSERT	58816D	-	-	-
5	FRONT NO. 2 CONSOLE BOX INSERT	58817A	-	-	-
6	AIRBAG ECU ASSEMBLY	89170A		-	-

PROCEDURE

1. PRECAUTION

CAUTION:

Be sure to read Precaution thoroughly before servicing.

Click here

NOTICE:

After the ignition switch is turned off, there may be a waiting time before disconnecting the negative (-) auxiliary battery terminal.

Click here

2. DISCONNECT CABLE FROM NEGATIVE AUXILIARY BATTERY TERMINAL

CAUTION:

Wait at least 60 seconds after disconnecting the cable from the negative (-) auxiliary battery terminal to disable the SRS system.

for M20A-FXS:
Click here
for 2ZR-FXE:
Click here

3. REMOVE NO. 1 INSTRUMENT PANEL UNDER COVER SUB-ASSEMBLY

Click here

4. REMOVE FRONT NO. 1 CONSOLE BOX INSERT

Click here

5. REMOVE FRONT NO. 2 CONSOLE BOX INSERT

Click here

6. REMOVE AIRBAG ECU ASSEMBLY

Illumination off

(1) Check that the ignition switch is off.

(2) Check that the cable is disconnected from the negative (-) auxiliary battery terminal.

CAUTION:

Wait at least 60 seconds after disconnecting the cable from the negative (-) auxiliary battery terminal to disable the SRS system.

Release the lock

Disconnect the connector

(1) Release the lock, and then disconnect the connectors.

NOTICE:

When disconnecting any airbag connector, take care not to damage the airbag wire harness.

(2) Remove the 3 bolts and airbag ECU assembly.

Installation

INSTALLATION

CAUTION / NOTICE / HINT

NOTICE:

After replacing the airbag ECU assembly, make sure to perform ECU Configuration, Update ECU Security Key, Write VIN/Vehicle Identification Number, and Switching Specification Information.
After performing the ECU configuration procedure and update ECU security key procedure, make sure to perform the initialization procedure for when the cable has been disconnected and reconnected to the negative (-) auxiliary battery terminal.

CAUTION / NOTICE / HINT

COMPONENTS (INSTALLATION)

Procedure		Part Name Code
1	AIRBAG ECU ASSEMBLY	89170A		-	-
2	FRONT NO. 1 CONSOLE BOX INSERT	58816D	-	-	-
3	FRONT NO. 2 CONSOLE BOX INSERT	58817A	-	-	-
4	NO. 1 INSTRUMENT PANEL UNDER COVER SUB-ASSEMBLY	55606	-	-	-
5	CONNECT CABLE TO NEGATIVE AUXILIARY BATTERY TERMINAL	-		-	-
6	ECU CONFIGURATION	-	-	-
7	UPDATE ECU SECURITY KEY	-	-	-
8	WRITE VIN/Toyota Prius Vehicle IDENTIFICATION NUMBER	-	-	-
9	SWITCHING SPECIFICATION INFORMATION	-	-	-
10	INSPECT SRS WARNING LIGHT	-	-	-
11	INITIALIZATION AFTER RECONNECTING AUXILIARY BATTERY TERMINAL	-	-	-
12	PERFORM INITIALIZATION	-	-	-

Tightening torque for "Major areas involving basic Toyota Prius vehicle performance such as moving/turning/stopping": N*m (kgf*cm, ft.*lbf)

Procedure		Part Name Code
13	BATTERY SERVICE HOLE COVER ASSEMBLY	58440		-	-

for M20A-FXS

PROCEDURE

1. INSTALL AIRBAG ECU ASSEMBLY

Illumination off

(1) Check that the ignition switch is off.

(2) Check that the cable is disconnected from the negative (-) auxiliary battery terminal.

CAUTION:

Wait at least 60 seconds after disconnecting the cable from the negative (-) auxiliary battery terminal to disable the SRS system.

Move in this Direction

(1) Install the airbag ECU assembly with the 3 bolts.

Torque:

17.5 N·m {178 kgf·cm, 13 ft·lbf}

NOTICE:

Temporarily tighten the bolt (A) and then fully tighten the 3 bolts in the order of (B), (C) and (A).
If the airbag ECU assembly has been dropped, or there are any cracks, dents or other defects in the case or connector, replace it with a new one.
When installing the airbag ECU assembly, make sure that the wire harness does not interfere with other parts and is not pinched.
When the ignition switch is first turned to ON after the airbag ECU assembly has been replaced, make sure that no one is in the Toyota Prius vehicle.

(2) Check that there is no looseness in the installed parts of the airbag ECU assembly.

(3) Temporarily connect the connectors and then move the lock lever in the direction indicated by the arrow to securely connect the connectors.

NOTICE:

When connecting any airbag connector, take care not to damage the airbag wire harness.

2. INSTALL FRONT NO. 1 CONSOLE BOX INSERT

3. INSTALL FRONT NO. 2 CONSOLE BOX INSERT

4. INSTALL NO. 1 INSTRUMENT PANEL UNDER COVER SUB-ASSEMBLY

5. CONNECT CABLE TO NEGATIVE AUXILIARY BATTERY TERMINAL

for M20A-FXS:
Click here
for 2ZR-FXE:
Click here

6. ECU CONFIGURATION

Click here

7. UPDATE ECU SECURITY KEY

Click here

8. WRITE VIN/Toyota Prius Vehicle IDENTIFICATION NUMBER

Click here

9. SWITCHING SPECIFICATION INFORMATION

Click here

10. INSPECT SRS WARNING LIGHT

Click here

11. INITIALIZATION AFTER RECONNECTING AUXILIARY BATTERY TERMINAL

HINT:

When disconnecting and reconnecting the auxiliary battery, there is an automatic learning function that completes learning when the respective system is used.

Click here