SUPPLEMENTAL RESTRAINT SYSTEMS: AIRBAG SYSTEM (for TMMMS Made): B1660; P Seat Airbag Active Mode Indicator; 2020 - 2021 MY Corolla Corolla Hatchback Corolla HV GR Corolla [03/2019

Last Modified: 05-13-2024	6.11:8.1.0	Doc ID: RM100000001HSIW
Model Year Start: 2020	Model: GR Corolla	Prod Date Range: [03/2019 - 06/2021]
Title: SUPPLEMENTAL RESTRAINT SYSTEMS: AIRBAG SYSTEM (for TMMMS Made): B1660; P Seat Airbag Active Mode Indicator; 2020 - 2021 MY Corolla Corolla Hatchback Corolla HV GR Corolla [03/2019 - 06/2021]

DTC

B1660

P Seat Airbag Active Mode Indicator

DESCRIPTION

The passenger airbag ON/OFF indicator circuit consists of the airbag sensor assembly and passenger airbag ON/OFF indicator (telltale light assembly).

The passenger airbag ON/OFF indicator indicates the operation condition of the instrument panel passenger airbag assembly.

DTC B1660 is stored when a malfunction is detected in the passenger airbag ON/OFF indicator circuit.

DTC No.	Detection Item	DTC Detection Condition	Trouble Area	Warning Indicate	Test Mode / Check Mode
B1660	P Seat Airbag Active Mode Indicator	The airbag sensor assembly detects a line short, short to ground or B+, or an open in the passenger airbag ON/OFF indicator circuit. Passenger airbag ON/OFF indicator malfunction Airbag sensor assembly malfunction	Instrument panel wire Instrument panel junction block assembly Passenger airbag ON/OFF indicator (Telltale light assembly) Airbag sensor assembly	Comes on	Does not apply to test/check mode

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

After turning the ignition switch off, waiting time may be required before disconnecting the cable from the negative (-) battery terminal. Therefore, make sure to read the disconnecting the cable from the negative (-) battery terminal notices before proceeding with work.
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Inspect the fuses for circuits related to this system before performing the following procedure.

PROCEDURE

1.	CHECK PASSENGER AIRBAG ON/OFF INDICATOR CONDITION

(a) Turn the ignition switch to ON.

(b) Check the passenger airbag ON/OFF indicator operation.

HINT:

Refer to the normal condition of the passenger airbag ON/OFF indicator.

Click here

Result	Proceed to
Passenger airbag ON/OFF indicator illumination is always on.	A
Passenger airbag ON/OFF indicator illumination is always off.	B

GO TO STEP 8

2.	CHECK CONNECTION OF CONNECTORS

(a) Turn the ignition switch off.

(b) Disconnect the cable from the negative (-) battery terminal.

CAUTION:

Wait at least 90 seconds after disconnecting the cable from the negative (-) battery terminal to disable the SRS system.

(c) Check that the connectors are properly connected to the airbag sensor assembly, telltale light assembly and instrument panel junction block assembly.

OK:

The connectors are properly connected.

CONNECT CONNECTORS PROPERLY

3.	CHECK CONNECTORS

(a) Disconnect the connectors from the airbag sensor assembly, telltale light assembly and instrument panel junction block assembly.

(b) Check that the terminals of the connectors are not deformed or damaged.

OK:

The terminals are not deformed or damaged.

REPLACE INSTRUMENT PANEL WIRE

4.	CHECK PASSENGER AIRBAG ON/OFF INDICATOR CONDITION

(a) Connect the connector to the telltale light assembly and instrument panel junction block assembly.

(b) Connect the cable to the negative (-) battery terminal.

(d) Check the passenger airbag ON/OFF indicator operation.

OK:

The passenger airbag ON/OFF indicator does not come on.

GO TO STEP 6

CHECK DTC

(a) Turn the ignition switch off.

*1	Instrument Panel Junction Block Assembly
*2	Airbag Sensor Assembly
*3	Telltale Light Assembly

(b) Disconnect the cable from the negative (-) battery terminal.

CAUTION:

Wait at least 90 seconds after disconnecting the cable from the negative (-) battery terminal to disable the SRS system.

(d) Connect the cable to the negative (-) battery terminal.

(e) Turn the ignition switch to ON, and wait for at least 60 seconds.

(f) Clear the DTCs stored in memory.

Body Electrical > SRS Airbag > Clear DTCs

(g) Turn the ignition switch off.

(h) Turn the ignition switch to ON, and wait for at least 60 seconds.

(i) Check for DTCs.

Body Electrical > SRS Airbag > Trouble Codes

OK:

DTC B1660 is not output.

HINT:

Codes other than DTC B1660 may be output at this time, but they are not related to this check.

USE SIMULATION METHOD TO CHECK

REPLACE AIRBAG SENSOR ASSEMBLY

6.	CHECK WIRE HARNESS

(a) Turn the ignition switch off.

*1	Instrument Panel Junction Block Assembly
*2	Airbag Sensor Assembly
*3	Telltale Light Assembly
*4	Instrument Panel Wire
*5	Service Wire
*a	Front view of wire harness connector (to Airbag Sensor Assembly)
*b	Front view of wire harness connector (to Telltale Light Assembly)

(b) Disconnect the cable from the negative (-) battery terminal.

CAUTION:

Wait at least 90 seconds after disconnecting the cable from the negative (-) battery terminal to disable the SRS system.

(d) Connect the cable to the negative (-) battery terminal.

(e) Turn the ignition switch to ON.

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

Standard Voltage:

Tester Connection	Condition	Specified Condition
I66-3 (PAON) - Body ground	Ignition switch ON	Below 1 V
I66-2 (P-AB) - Body ground	Ignition switch ON	Below 1 V

(g) Turn the ignition switch off.

(h) Disconnect the cable from the negative (-) battery terminal.

CAUTION:

Wait at least 90 seconds after disconnecting the cable from the negative (-) battery terminal to disable the SRS system.

(i) Using a service wire, connect terminals 35 (PAON) and 34 (P-AB) of connector B.

NOTICE:

Do not forcibly insert the service wire into the terminals of the connector when connecting the wire.

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
I66-3 (PAON) - I66-2 (P-AB)	Always	Below 1 Ω

(k) Disconnect the service wire from connector B.

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
I66-3 (PAON) - I66-2 (P-AB)	Always	1 MΩ or higher
I66-3 (PAON) - Body ground	Always	1 MΩ or higher
I66-2 (P-AB) - Body ground	Always	1 MΩ or higher

REPLACE TELLTALE LIGHT ASSEMBLY

7.	CHECK INSTRUMENT PANEL WIRE

(a) Disconnect the connector from the instrument panel junction block assembly.

*1	Instrument Panel Junction Block Assembly	*2	Airbag Sensor Assembly
*3	Telltale Light Assembly	*4	Instrument Panel Wire
*5	Service Wire	-	-
*a	Front view of wire harness connector (to Instrument Panel Junction Block Assembly)	*b	Front view of wire harness connector (to Airbag Sensor Assembly)
*c	Front view of wire harness connector (to Telltale Light Assembly)	-	-

(b) Using a service wire, connect terminals 35 (PAON) and 34 (P-AB) of connector B.

NOTICE:

Do not forcibly insert the service wire into the terminals of the connector when connecting the wire.

Standard Resistance:

Tester Connection	Condition	Specified Condition
4E-8 (PAON) - 4E-46 (P-AB)	Always	Below 1 Ω

(d) Disconnect the service wire from connector B.

(e) Using a service wire, connect terminals 3 (PAON) and 2 (P-AB) of connector E.

NOTICE:

Do not forcibly insert the service wire into the terminals of the connector when connecting the wire.

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
4E-29 (PAON) - 4E-51 (P-AB)	Always	Below 1 Ω

(g) Disconnect the service wire from connector E.

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
4E-8 (PAON) - Body ground or other terminals	Always	1 MΩ or higher
4E-29 (PAON) - Body ground or other terminals	Always	1 MΩ or higher
4E-46 (P-AB) - Body ground or other terminals	Always	1 MΩ or higher
4E-51 (P-AB) - Body ground or other terminals	Always	1 MΩ or higher

REPLACE INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY

REPLACE INSTRUMENT PANEL WIRE

8.	CHECK CONNECTION OF CONNECTORS

(a) Turn the ignition switch off.

(b) Disconnect the cable from the negative (-) battery terminal.

CAUTION:

Wait at least 90 seconds after disconnecting the cable from the negative (-) battery terminal to disable the SRS system.

(c) Check that the connectors are properly connected to the airbag sensor assembly, telltale light assembly and instrument panel junction block assembly.

OK:

The connectors are properly connected.

CONNECT CONNECTORS PROPERLY

9.	CHECK CONNECTORS

(a) Disconnect the connectors from the airbag sensor assembly, telltale light assembly and instrument panel junction block assembly.

(b) Check that the terminals of the connectors are not deformed or damaged.

OK:

The terminals are not deformed or damaged.

REPLACE INSTRUMENT PANEL WIRE

10.	CHECK WIRE HARNESS

(a) Connect the connector to the instrument panel junction block assembly.

*1	Instrument Panel Junction Block Assembly
*2	Airbag Sensor Assembly
*3	Telltale Light Assembly
*4	Instrument Panel Wire
*5	Service Wire
*a	Front view of wire harness connector (to Airbag Sensor Assembly)
*b	Front view of wire harness connector (to Telltale Light Assembly)

(b) Connect the cable to the negative (-) battery terminal.

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

Standard Voltage:

Tester Connection	Condition	Specified Condition
I66-3 (PAON) - Body ground	Ignition switch ON	Below 1 V
I66-2 (P-AB) - Body ground	Ignition switch ON	Below 1 V

(e) Turn the ignition switch off.

(f) Disconnect the cable from the negative (-) battery terminal.

CAUTION:

Wait at least 90 seconds after disconnecting the cable from the negative (-) battery terminal to disable the SRS system.

(g) Using a service wire, connect terminals 35 (PAON) and 34 (P-AB) of connector B.

NOTICE:

Do not forcibly insert the service wire into the terminals of the connector when connecting the wire.

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
I66-3 (PAON) - I66-2 (P-AB)	Always	Below 1 Ω

(i) Disconnect the service wire from connector B.

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
I66-3 (PAON) - I66-2 (P-AB)	Always	1 MΩ or higher
I66-3 (PAON) - Body ground	Always	1 MΩ or higher
I66-2 (P-AB) - Body ground	Always	1 MΩ or higher

GO TO STEP 14

11.	CHECK PASSENGER AIRBAG ON/OFF INDICATOR (SOURCE VOLTAGE)

(a) Connect the cable to the negative (-) battery terminal.

*1	Instrument Panel Junction Block Assembly
*2	Airbag Sensor Assembly
*3	Telltale Light Assembly
*4	Instrument Panel Wire
*a	Front view of wire harness connector (to Telltale Light Assembly)

(b) Turn the ignition switch to ON.

Standard Voltage:

Tester Connection	Condition	Specified Condition
I66-5 (IG+) - Body ground	Ignition switch ON	11 to 14 V

(d) Turn the ignition switch off.

(e) Disconnect the cable from the negative (-) battery terminal.

CAUTION:

Wait at least 90 seconds after disconnecting the cable from the negative (-) battery terminal to disable the SRS system.

REPLACE WIRE HARNESS OR BATTERY

12.	CHECK PASSENGER AIRBAG ON/OFF INDICATOR

(a) Connect the connector to the telltale light assembly.

*1	Instrument Panel Junction Block Assembly
*2	Airbag Sensor Assembly
*3	Telltale Light Assembly
*4	Instrument Panel Wire
*a	Front view of wire harness connector (to Airbag Sensor Assembly)

(b) Connect the cable to the negative (-) battery terminal.

(d) Check the passenger airbag ON/OFF indicator according to the conditions in the table below.

OK:

Terminal Connection	Condition	Specified Condition
I47-35 (PAON) - Body ground	Ignition switch ON	"ON" comes on
I47-34 (P-AB) - Body ground	Ignition switch ON	"OFF" comes on

(e) Turn the ignition switch off.

(f) Disconnect the cable from the negative (-) battery terminal.

CAUTION:

Wait at least 90 seconds after disconnecting the cable from the negative (-) battery terminal to disable the SRS system.

REPLACE TELLTALE LIGHT ASSEMBLY

13.

CHECK DTC

(a) Connect the connector to the airbag sensor assembly.

*1	Instrument Panel Junction Block Assembly
*2	Airbag Sensor Assembly
*3	Telltale Light Assembly

(b) Connect the cable to the negative (-) battery terminal.

(d) Clear the DTCs stored in memory.

Body Electrical > SRS Airbag > Clear DTCs

(e) Turn the ignition switch off.

(f) Turn the ignition switch to ON, and wait for at least 60 seconds.

(g) Check for DTCs.

Body Electrical > SRS Airbag > Trouble Codes

OK:

DTC B1660 is not output.

HINT:

Codes other than DTC B1660 may be output at this time, but they are not related to this check.

USE SIMULATION METHOD TO CHECK

REPLACE AIRBAG SENSOR ASSEMBLY

14.	CHECK INSTRUMENT PANEL WIRE

(a) Disconnect the connector from the instrument panel junction block assembly.

*1	Instrument Panel Junction Block Assembly	*2	Airbag Sensor Assembly
*3	Telltale Light Assembly	*4	Instrument Panel Wire
*5	Service Wire	-	-
*a	Front view of wire harness connector (to Instrument Panel Junction Block Assembly)	*b	Front view of wire harness connector (to Airbag Sensor Assembly)
*c	Front view of wire harness connector (to Telltale Light Assembly)	-	-

(b) Using a service wire, connect terminals 35 (PAON) and 34 (P-AB) of connector B.

NOTICE:

Do not forcibly insert the service wire into the terminals of the connector when connecting the wire.

Standard Resistance:

Tester Connection	Condition	Specified Condition
4E-8 (PAON) - 4E-46 (P-AB)	Always	Below 1 Ω

(d) Disconnect the service wire from connector B.

(e) Using a service wire, connect terminals 3 (PAON) and 2 (P-AB) of connector E.

NOTICE:

Do not forcibly insert the service wire into the terminals of the connector when connecting the wire.

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
4E-29 (PAON) - 4E-51 (P-AB)	Always	Below 1 Ω

(g) Disconnect the service wire from connector E.

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
4E-8 (PAON) - Body ground or other terminals	Always	1 MΩ or higher
4E-29 (PAON) - Body ground or other terminals	Always	1 MΩ or higher
4E-46 (P-AB) - Body ground or other terminals	Always	1 MΩ or higher
4E-51 (P-AB) - Body ground or other terminals	Always	1 MΩ or higher

REPLACE INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY

REPLACE INSTRUMENT PANEL WIRE