Lexus IS250 IS220d GSE20 ALE20 - SUPPLEMENTAL RESTRAINT SYSTEM
CHECK FRONT PASSENGER AIRBAG ASSEMBLY (FRONT PASSENGER SIDE SQUIB 2ND STEP)
CHECK FRONT PASSENGER SIDE SQUIB 2ND STEP CIRCUIT
CHECK CENTER AIRBAG SENSOR ASSEMBLY
CHECK INSTRUMENT PANEL WIRE ASSEMBLY
DTC B1815/54 Short in Front Passenger Side Squib 2nd Step Circuit
DTC B1816/54 Open in Front Passenger Side Squib 2nd Step Circuit
DTC B1817/54 Short to GND in Front Passenger Side Squib 2nd Step Circuit
DTC B1818/54 Short to B+ in Front Passenger Side Squib 2nd Step Circuit
DESCRIPTION
The front passenger side squib 2nd step circuit consists of the center airbag sensor assembly and the front passenger airbag assembly.
The circuit instructs the SRS to deploy when deployment conditions are met.
These DTCs are recorded when a malfunction is detected in the front passenger side squib 2nd step circuit.
| DTC No. | DTC Detecting Condition | Trouble Area |
| B1815/54 | The center airbag sensor assembly receives a line short circuit signal 5 times in the front passenger side squib 2nd step circuit during primary check. Front passenger side squib 2nd step malfunction Center airbag sensor assembly malfunction | Instrument panel wire Instrument panel wire assembly Front passenger airbag assembly (Front passenger side squib 2nd step) Center airbag sensor assembly |
| B1816/54 | The center airbag sensor assembly receives an open circuit signal in the front passenger side squib 2nd step circuit for 2 seconds. Front passenger side squib 2nd step malfunction Center airbag sensor assembly malfunction | Instrument panel wire Instrument panel wire assembly Front passenger airbag assembly (Front passenger side squib 2nd step) Center airbag sensor assembly |
| B1817/54 | The center airbag sensor assembly receives a short circuit to ground signal in the front passenger side squib 2nd step circuit for 0.5 seconds. Front passenger side squib 2nd step malfunction Center airbag sensor assembly malfunction | Instrument panel wire Instrument panel wire assembly Front passenger airbag assembly (Front passenger side squib 2nd step) Center airbag sensor assembly |
| B1818/54 | The center airbag sensor assembly receives a short circuit to B+ signal in the front passenger side squib 2nd step circuit for 0.5 seconds. Front passenger side squib 2nd step malfunction Center airbag sensor assembly malfunction | Instrument panel wire Instrument panel wire assembly Front passenger airbag assembly (Front passenger side squib 2nd step) Center airbag sensor assembly |
WIRING DIAGRAM
INSPECTION PROCEDURE
- HINT:
| 1.CHECK FRONT PASSENGER AIRBAG ASSEMBLY (FRONT PASSENGER SIDE SQUIB 2ND STEP) |
Turn the engine switch off.
Disconnect the negative (-) terminal cable from the battery, and wait for at least 90 seconds.
Disconnect the connectors from the front passenger airbag assembly.
Connect the white wire side of SST (resistance 2.1 Ω) to connector "E" (black connector).
- CAUTION:
- Never connect a tester to the front passenger airbag assembly (front passenger side squib 2nd step) for measurement, as this may lead to a serious injury due to airbag deployment.
- NOTICE:
- SST
- 09843-18060
Connect the negative (-) terminal cable to the battery, and wait for at least 2 seconds.
Turn the engine switch on (IG), and wait for at least 60 seconds.
Clear the DTCs stored in the memory .
Turn the engine switch off.
Turn the engine switch on (IG), and wait for at least 60 seconds.
Check for DTCs .
- OK:
- DTC B1815, B1816, B1817, B1818 or 54 is not output.
- HINT:
- Codes other than DTC B1815, B1816, B1817, B1818 and 54 may be output at this time, but they are not related to this check.
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| OK | |
| 4.CHECK CENTER AIRBAG SENSOR ASSEMBLY |
Connect the connectors to the front passenger airbag assembly and the center airbag sensor assembly.
Connect the negative (-) terminal cable to the battery, and wait for at least 2 seconds.
Turn the engine switch on (IG), and wait for at least 60 seconds.
Clear the DTCs stored in the memory .
Turn the engine switch off.
Turn the engine switch on (IG), and wait for at least 60 seconds.
Check for DTCs .
- OK:
- DTC B1815, B1816, B1817, B1818 or 54 is not output.
- HINT:
- Codes other than DTC B1815, B1816, B1817, B1818 and 54 may be output at this time, but they are not related to this check.
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| OK | ||
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| 5.CHECK INSTRUMENT PANEL WIRE |
Check for a short to B+ in the circuit.
Restore the released activation prevention mechanism of connector "B" to the original condition.
Disconnect the instrument panel wire connector from the instrument panel wire assembly.
Connect the negative (-) terminal cable to the battery, and wait for at least 2 seconds.
Turn the engine switch on (IG).
Measure the voltage according to the value(s) in the table below.
- Standard voltage:
Tester connection Condition Specified condition Ja1-3 (P2+) - Body ground Engine switch on (IG) Below 1 V Ja1-4 (P2-) - Body ground Engine switch on (IG) Below 1 V
Check for an open in the circuit.
Turn the engine switch off.
Disconnect the negative (-) terminal cable from the battery, and wait for at least 90 seconds.
Measure the resistance according to the value(s) in the table below.
- Standard resistance:
Tester connection Condition Specified condition Ja1-3 (P2+) - Ja1-4 (P2-) Always Below 1 Ω
Check for a short to ground in the circuit.
Measure the resistance according to the value(s) in the table below.
- Standard resistance:
Tester connection Condition Specified condition Ja1-3 (P2+) - Body ground Always 1 MΩ or higher Ja1-4 (P2-) - Body ground Always 1 MΩ or higher
Check for a short in the circuit.
Release the activation prevention mechanism built into connector "B" .
Measure the resistance according to the value(s) in the table below.
- Standard resistance:
Tester connection Condition Specified condition Ja1-3 (P2+) - Ja1-4 (P2-) Always 1 MΩ or higher
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| OK | |
| 6.CHECK INSTRUMENT PANEL WIRE ASSEMBLY |
Check for a short to B+ in the circuit.
Connect the negative (-) terminal cable to the battery, and wait for at least 2 seconds.
Turn the engine switch on (IG).
Measure the voltage according to the value(s) in the table below.
- Standard voltage:
Tester connection Condition Specified condition a2-2 (P2+) - Body ground Engine switch on (IG) Below 1 V a2-1 (P2-) - Body ground Engine switch on (IG) Below 1 V
Check for an open in the circuit.
Turn the engine switch off.
Disconnect the negative (-) terminal cable from the battery, and wait for at least 90 seconds.
Measure the resistance according to the value(s) in the table below.
- Standard resistance:
Tester connection Condition Specified condition a2-2 (P2+) - a2-1 (P2-) Always Below 1 Ω
Check for a short to ground in the circuit.
Measure the resistance according to the value(s) in the table below.
- Standard resistance:
Tester connection Condition Specified condition a2-2 (P2+) - Body ground Always 1 MΩ or higher a2-1 (P2-) - Body ground Always 1 MΩ or higher
Check for a short in the circuit.
Release the activation prevention mechanism built into connector "D" .
Measure the resistance according to the value(s) in the table below.
- Standard resistance:
Tester connection Condition Specified condition a2-2 (P2+) - a2-1 (P2-) Always 1 MΩ or higher
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| OK | ||
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