SUPPLEMENTAL RESTRAINT SYSTEMS AIRBAG SYSTEM SRS Warning Light does not Come ON
DESCRIPTION
The SRS warning light is located in the combination meter assembly.
When the SRS is normal, the SRS warning light comes on for approximately 6 seconds after the ignition switch is turned from off to ON, and then goes off automatically.
If there is a malfunction in the SRS, the SRS warning light comes on to inform the driver of a problem.
The SRS is equipped with a voltage-increase circuit (DC-DC converter) in the airbag sensor assembly in case the source voltage drops.
When the auxiliary battery voltage drops, the voltage-increase circuit (DC-DC converter) functions to increase the voltage of the SRS to normal voltage.
A malfunction in this circuit is not recorded in the airbag sensor assembly. The SRS warning light automatically goes off when the source voltage returns to normal.
The signal to illuminate the SRS warning light is transmitted from the airbag sensor assembly to the combination meter assembly through the CAN communication system.
WIRING DIAGRAM
CAUTION / NOTICE / HINT
- NOTICE:
- ·
After the ignition switch is turned off, there may be a waiting time before disconnecting the negative (-) auxiliary battery terminal.
·When disconnecting and reconnecting the auxiliary battery.
- HINT:
-
When disconnecting and reconnecting the auxiliary battery, there is an automatic learning function that completes learning when the respective system is used.
·After replacing the airbag sensor assembly, refer to work procedure.
·Inspect the fuses for circuits related to this system before performing the following procedure.
·When replacing the combination meter assembly, always replace it with a new one. If a combination meter assembly which was installed to another vehicle is used, the information stored in it will not match the information from the vehicle and a DTC may be stored.
PROCEDURE
Measure the auxiliary battery voltage with the ignition switch off.
- Standard Voltage:
11 to 14 V
- Result:
Proceed to OK NG
OK
NG
Turn the ignition switch off.
Disconnect the cable from the negative (-) auxiliary battery terminal, and wait for at least 60 seconds.
Check that the connector is properly connected to the combination meter assembly.
- OK:
The connector is properly connected.
- Result:
Proceed to OK NG
OK
NG
| *1 | Combination Meter Assembly |
| *2 | Airbag Sensor Assembly |
| *3 | Wire Harness |
Disconnect the combination meter assembly connector.
Check that the terminals of the connector are not deformed or damaged.
- OK:
The terminals are not deformed or damaged.
- Result:
Proceed to OK NG
OK
NG
| *A | for Optitron Meter Type |
| *B | for TFT Meter Type |
| *a | Front view of wire harness connector
(to Combination Meter Assembly) |
Connect the cable to the negative (-) auxiliary battery terminal, and wait for at least 2 seconds.
Turn the ignition switch to ON.
Measure the voltage according to the value(s) in the table below.
- Standard Voltage:
for Optitron Meter Type Tester Connection Condition Specified Condition *1: w/o Stop and Start System
*2: w/ Stop and Start System
Click Location & Routing(E17)Location & Routingewd_type=routing;type=c;code=E17
Click Connector(E17)Instrument Panel>Instrument Panel Wire / Telephone Computer Wire>Combination Meter Assemblyewd_type=component;type=c;code=E17;pinno=39
E17-39 (IG+) - Body ground Ignition switch ON 11 to 14 V*1
10.5 to 16 V*2
for TFT Meter Type Tester Connection Condition Specified Condition *1: w/o Stop and Start System
*2: w/ Stop and Start System
Click Location & Routing(E143)Location & Routingewd_type=routing;type=c;code=E143
Click Connector(E143)Instrument Panel>Instrument Panel Wire / Telephone Computer Wire>Combination Meter Assemblyewd_type=component;type=c;code=E143;pinno=6
E143-6 (IG+) - Body ground Ignition switch ON 11 to 14 V*1
10.5 to 16 V*2
Turn the ignition switch off.
Measure the resistance according to the value(s) in the table below.
- Standard Resistance:
for Optitron Meter Type Tester Connection Condition Specified Condition Click Location & Routing(E17)Location & Routingewd_type=routing;type=c;code=E17
Click Connector(E17)Instrument Panel>Instrument Panel Wire / Telephone Computer Wire>Combination Meter Assemblyewd_type=component;type=c;code=E17;pinno=2,21
E17-2 (EP) - Body ground Always Below 1 Ω E17-21 (ES) - Body ground Always Below 1 Ω
for TFT Meter Type Tester Connection Condition Specified Condition Click Location & Routing(E143)Location & Routingewd_type=routing;type=c;code=E143
Click Connector(E143)Instrument Panel>Instrument Panel Wire / Telephone Computer Wire>Combination Meter Assemblyewd_type=component;type=c;code=E143;pinno=1,2
E143-1 (EP) - Body ground Always Below 1 Ω E143-2 (ES) - Body ground Always Below 1 Ω
- Result:
Proceed to OK NG
OK
NG
| *1 | Combination Meter Assembly |
| *2 | Airbag Sensor Assembly |
| *3 | Wire Harness |
Disconnect the cable from the negative (-) auxiliary battery terminal, and wait for at least 60 seconds.
Connect the combination meter assembly connector.
Disconnect the airbag sensor assembly connector.
Connect the cable to the negative (-) auxiliary battery terminal, and wait for at least 2 seconds.
Turn the ignition switch to ON.
Approximately 6 seconds after the ignition switch is turned to ON, check the condition of the SRS warning light.
- Result:
Proceed to Turns off for 10 seconds, and then illuminates Turns off for 10 seconds, and then remains off
Turns off for 10 seconds, and then illuminates
Turns off for 10 seconds, and then remains off