Supplemental Restraint Systems. Dtc B1660/43 Passenger Airbag On/Off Indicator Circuit Malfunction

The passenger airbag ON/OFF indicator circuit consists of the center airbag sensor assembly and the telltale light assembly.
The passenger airbag ON/OFF indicator indicates the operation condition of the front passenger airbag, the front seat side airbag RH and front seat belt pretensioner RH.
DTC B1660/43 is recorded when a malfunction is detected in the passenger airbag ON/OFF indicator circuit.

DTC No.	DTC Detecting Condition	Trouble Area
B1660/43	The center airbag sensor assembly receives a line short circuit signal, an open circuit signal, a short circuit to ground signal or a short circuit to B+ signal in the passenger airbag ON/OFF indicator circuit. Telltale light assembly malfunction Center airbag sensor assembly malfunction	Instrument panel wire Telltale light assembly (Passenger airbag ON/OFF indicator) Center airbag sensor assembly

WIRING DIAGRAM

Corolla. Zre142 Aze141.Supplemental Restraint Systems.Airbag System.
Dtc
B1660/43 Passenger Airbag On/Off Indicator Circuit Malfunction

INSPECTION PROCEDURE

1.CHECK PASSENGER AIRBAG ON/OFF INDICATOR CONDITION

Turn the ignition switch to ON.

Check the passenger airbag ON/OFF indicator operation.
Result:
ON/OFF Indicator Illumination
Proceed to
Always ON
A
OFF
B
HINT:
Refer to the normal condition of the passenger airbag ON/OFF indicator (Link).

Go to step 10

A

2.CHECK CONNECTOR

Turn the ignition switch off.

Disconnect the cable from the negative (-) battery terminal, and wait for at least 90 seconds.

Check that the connector is properly connected to the center airbag sensor assembly.
OK:
The connector is properly connected.
HINT:
If the connector is not connected securely, reconnect the connector and proceed to the next inspection.

Disconnect the connector from the center airbag sensor assembly.

Check that the terminal of the connector is not damaged.
OK:
The terminal is not deformed or damaged.

REPLACE INSTRUMENT PANEL WIRE

OK

3.CHECK PASSENGER AIRBAG ON/OFF INDICATOR

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

Turn the ignition switch to ON.

Check the passenger airbag ON/OFF indicator operation.
OK:
The passenger airbag ON/OFF indicator does not come on.

Go to step 5

OK

4.CHECK CENTER AIRBAG SENSOR ASSEMBLY

Turn the ignition switch off.

Disconnect the cable from the negative (-) battery terminal, and wait for at least 90 seconds.

Connect the connector to the center airbag sensor assembly.

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

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

Clear the DTCs stored in the memory (COROLLA_ZRE142 RM000000XFE0H1X.html).

Turn the ignition switch off.

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

Check for DTCs (COROLLA_ZRE142 RM000000XFE0H1X.html).
OK:
DTC B1660/43 is not output.
HINT:
Codes other than DTC B1660/43 may be output at this time, but they are not related to this check.

REPLACE CENTER AIRBAG SENSOR ASSEMBLY (COROLLA_ZRE142 RM000000UWV074X.html)

USE SIMULATION METHOD TO CHECK (COROLLA_ZRE142 RM000000XFD0GSX.html)

5.CHECK CONNECTOR

Turn the ignition switch off.

Disconnect the cable from the negative (-) battery terminal, and wait for at least 90 seconds.

Check that the connector is properly connected to the telltale light assembly.
OK:
The connector is properly connected.
HINT:
If the connector is not connected securely, reconnect the connector and proceed to the next inspection.

Disconnect the connector from the telltale light assembly.

Check that the terminal of the connector is not damaged.
OK:
The terminal is not deformed or damaged.

REPLACE INSTRUMENT PANEL WIRE

OK

6.CHECK INSTRUMENT PANEL WIRE (OPEN)

Using SST, connect terminals 23 (PAON) and 17 (P-AB) of connector B.

NOTICE:
Do not forcibly insert SST into the terminals of the connector when connecting.

SST: 09843-18040

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

Standard Resistance:
w/o Daytime Running Light:
Tester Connection
Condition
Specified Condition
E48-9 (PAON) - E48-10 (P-AB)
Always
Below 1 Ω
w/ Daytime Running Light:
Tester Connection
Condition
Specified Condition
E124-7 (PAON) - E124-6 (P-AB)
Always
Below 1 Ω

w/o Daytime Running Light:
Tester Connection	Condition	Specified Condition
E48-9 (PAON) - E48-10 (P-AB)	Always	Below 1 Ω

w/ Daytime Running Light:
Tester Connection	Condition	Specified Condition
E124-7 (PAON) - E124-6 (P-AB)	Always	Below 1 Ω

REPLACE INSTRUMENT PANEL WIRE

OK

7.CHECK INSTRUMENT PANEL WIRE (SHORT)

Disconnect SST from connector B.

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

Standard Resistance:
w/o Daytime Running Light:
Tester Connection
Condition
Specified Condition
E48-9 (PAON) - E48-10 (P-AB)
Always
1 MΩ or higher
w/ Daytime Running Light:
Tester Connection
Condition
Specified Condition
E124-7 (PAON) - E124-6 (P-AB)
Always
1 MΩ or higher

w/o Daytime Running Light:
Tester Connection	Condition	Specified Condition
E48-9 (PAON) - E48-10 (P-AB)	Always	1 MΩ or higher

w/ Daytime Running Light:
Tester Connection	Condition	Specified Condition
E124-7 (PAON) - E124-6 (P-AB)	Always	1 MΩ or higher

REPLACE INSTRUMENT PANEL WIRE

OK

8.CHECK INSTRUMENT PANEL WIRE (SHORT TO GROUND)

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

Standard Resistance:
w/o Daytime Running Light:
Tester Connection
Condition
Specified Condition
E48-9 (PAON) - Body ground
Always
1 MΩ or higher
E48-10 (P-AB) - Body ground
Always
1 MΩ or higher
w/ Daytime Running Light:
Tester Connection
Condition
Specified Condition
E124-7 (PAON) - Body ground
Always
1 MΩ or higher
E124-6 (P-AB) - Body ground
Always
1 MΩ or higher

w/o Daytime Running Light:
Tester Connection	Condition	Specified Condition
E48-9 (PAON) - Body ground	Always	1 MΩ or higher
E48-10 (P-AB) - Body ground	Always	1 MΩ or higher

w/ Daytime Running Light:
Tester Connection	Condition	Specified Condition
E124-7 (PAON) - Body ground	Always	1 MΩ or higher
E124-6 (P-AB) - Body ground	Always	1 MΩ or higher

REPLACE INSTRUMENT PANEL WIRE

OK

9.CHECK INSTRUMENT PANEL WIRE (SHORT TO B+)

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

Turn the ignition switch to ON.

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

Standard Voltage:
w/o Daytime Running Light:
Tester Connection
Switch Condition
Specified Condition
E48-9 (PAON) - Body ground
Ignition switch ON
Below 1 V
E48-10 (P-AB) - Body ground
Ignition switch ON
Below 1 V
w/ Daytime Running Light:
Tester Connection
Switch Condition
Specified Condition
E124-7 (PAON) - Body ground
Ignition switch ON
Below 1 V
E124-6 (P-AB) - Body ground
Ignition switch ON
Below 1 V

REPLACE INSTRUMENT PANEL WIRE

REPLACE TELLTALE LIGHT ASSEMBLY (COROLLA_ZRE142 RM000002XFP01GX.html)

10.CHECK CONNECTORS

Turn the ignition switch off.

Disconnect the cable from the negative (-) battery terminal, and wait for at least 90 seconds.

Check that the connectors are properly connected to the center airbag sensor assembly and the telltale light assembly.
OK:
The connectors are properly connected.
HINT:
If the connectors are not connected securely, reconnect the connectors and proceed to the next inspection.

Disconnect the connectors from the center airbag sensor assembly and the telltale light assembly.

Check that the terminals of the connectors are not damaged.
OK:
The terminals are not deformed or damaged.

REPLACE INSTRUMENT PANEL WIRE

OK

11.CHECK INSTRUMENT PANEL WIRE (OPEN)

Using SST, connect terminals 23 (PAON) and 17 (P-AB) of connector B.

NOTICE:
Do not forcibly insert SST into the terminals of the connector when connecting.

SST: 09843-18040

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

Standard Resistance:
w/o Daytime Running Light:
Tester Connection
Condition
Specified Condition
E48-9 (PAON) - E48-10 (P-AB)
Always
Below 1 Ω
w/ Daytime Running Light:
Tester Connection
Condition
Specified Condition
E124-7 (PAON) - E124-6 (P-AB)
Always
Below 1 Ω

REPLACE INSTRUMENT PANEL WIRE

OK

12.CHECK INSTRUMENT PANEL WIRE (SHORT)

Disconnect SST from connector B.

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

Standard Resistance:
w/o Daytime Running Light:
Tester Connection
Condition
Specified Condition
E48-9 (PAON) - E48-10 (P-AB)
Always
1 MΩ or higher
w/ Daytime Running Light:
Tester Connection
Condition
Specified Condition
E124-7 (PAON) - E124-6 (P-AB)
Always
1 MΩ or higher

REPLACE INSTRUMENT PANEL WIRE

OK

13.CHECK INSTRUMENT PANEL WIRE (SHORT TO GROUND)

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

Standard Resistance:
w/o Daytime Running Light:
Tester Connection
Condition
Specified Condition
E48-9 (PAON) - Body ground
Always
1 MΩ or higher
E48-10 (P-AB) - Body ground
Always
1 MΩ or higher
w/ Daytime Running Light:
Tester Connection
Condition
Specified Condition
E124-7 (PAON) - Body ground
Always
1 MΩ or higher
E124-6 (P-AB) - Body ground
Always
1 MΩ or higher

REPLACE INSTRUMENT PANEL WIRE

OK

14.CHECK INSTRUMENT PANEL WIRE (SHORT TO B+)

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

Turn the ignition switch to ON.

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

Standard Voltage:
w/o Daytime Running Light:
Tester Connection
Switch Condition
Specified Condition
E48-9 (PAON) - Body ground
Ignition switch ON
Below 1 V
E48-10 (P-AB) - Body ground
Ignition switch ON
Below 1 V
w/ Daytime Running Light:
Tester Connection
Switch Condition
Specified Condition
E124-7 (PAON) - Body ground
Ignition switch ON
Below 1 V
E124-6 (P-AB) - Body ground
Ignition switch ON
Below 1 V

REPLACE INSTRUMENT PANEL WIRE

OK

15.CHECK TELLTALE LIGHT ASSEMBLY (SOURCE VOLTAGE)

Connect the connector to the center airbag sensor assembly.

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

Turn the ignition switch to ON.

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

Standard Voltage:
w/o Daytime Running Light:
Tester Connection
Switch Condition
Specified Condition
E48-3 (B) - Body ground
Ignition switch ON
10 to 16V
w/ Daytime Running Light:
Tester Connection
Switch Condition
Specified Condition
E124-4 (B) - Body ground
Ignition switch ON
10 to 16V

REPLACE WIRE HARNESS OR BATTERY

OK

16.CHECK PASSENGER AIRBAG ON/OFF INDICATOR

Turn the ignition switch off.

Disconnect the cable from the negative (-) battery terminal, and wait for at least 90 seconds.

Connect the connector to the telltale light assembly.

Disconnect the connector from the center airbag sensor assembly.

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

Turn the ignition switch to ON.

Check the indicator according to the conditions in the table below.
Indicator Condition:
Terminal Connection
Switch Condition
Passenger Airbag ON/OFF Indicator
E14-23 (PAON) - Body ground
Ignition switch ON
"ON" comes on
E14-17 (P-AB) - Body ground
Ignition switch ON
"OFF" comes on

REPLACE TELLTALE LIGHT ASSEMBLY (COROLLA_ZRE142 RM000002XFP01GX.html)

OK

17.CHECK CENTER AIRBAG SENSOR ASSEMBLY

Turn the ignition switch off.

Disconnect the cable from the negative (-) battery terminal, and wait for at least 90 seconds.

Connect the connector to the center airbag sensor assembly.

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

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

Clear the DTCs stored in the memory (COROLLA_ZRE142 RM000000XFE0H1X.html).

Turn the ignition switch off.

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

Check for DTCs (COROLLA_ZRE142 RM000000XFE0H1X.html).
OK:
DTC B1660/43 is not output.
HINT:
Codes other than DTC B1660/43 may be output at this time, but they are not related to this check.

REPLACE CENTER AIRBAG SENSOR ASSEMBLY (COROLLA_ZRE142 RM000000UWV074X.html)

USE SIMULATION METHOD TO CHECK (COROLLA_ZRE142 RM000000XFD0GSX.html)

Tester Connection	Switch Condition	Specified Condition
E48-9 (PAON) - Body ground	Ignition switch ON	Below 1 V
E48-10 (P-AB) - Body ground	Ignition switch ON	Below 1 V

Terminal Connection	Switch Condition	Passenger Airbag ON/OFF Indicator
E14-23 (PAON) - Body ground	Ignition switch ON	"ON" comes on
E14-17 (P-AB) - Body ground	Ignition switch ON	"OFF" comes on

ON/OFF Indicator Illumination	Proceed to
Always ON	A
OFF	B