B1821
SUPPLEMENTAL RESTRAINT SYSTEM: AIRBAG SYSTEM: B1820/55: Short in Front Driver Side - Side Squib Circuit
DTC B1820/55 - Short in Front Driver Side - Side Squib Circuit
DTC B1821/55 - Open in Front Driver Side - Side Squib Circuit
DTC B1822/55 - Short to GND in Front Driver Side - Side Squib Circuit
DTC B1823/55 - Short to B+ in Front Driver Side - Side Squib Circuit
DESCRIPTION
The side squib LH circuit consists of the center airbag sensor and the front seat side airbag LH.
The circuit instructs the SRS to deploy when the deployment conditions are met.
These DTCs are recorded when a malfunction is detected in the side squib LH circuit.
WIRING DIAGRAM
INSPECTION PROCEDURE
NOTICE:
- When disconnecting the cable from the negative (-) battery terminal while performing repairs, some systems need to be initialized after the cable is reconnected Repair Instruction - Initialization.
- After the ignition switch is turned OFF, the navigation system requires approximately 90 seconds to record various types of memory and settings. As a result, after turning the ignition switch OFF, wait 90 seconds or more before disconnecting the cable from the negative (-) battery terminal.
HINT:
- Perform the simulation method by selecting "check mode" (signal check) with the Techstream Check Mode Procedure.
- After selecting "check mode" (signal check), perform the simulation method by wiggling each connector of the airbag system or driving the vehicle on various types of roads Diagnosis System.
PROCEDURE
1. CHECK FRONT SEAT SIDE AIRBAG LH (SIDE SQUIB LH)
(a) Turn the ignition switch OFF.
(b) Disconnect the negative (-) terminal cable from the battery, and wait for at least 90 seconds.
(c) Disconnect the connector from the front seat side airbag LH.
(d) Connect the red wire side of SST (resistance: 2.1 Ohms) to connector C.
CAUTION: Never connect the tester to the front seat side airbag LH (side squib LH) for measurement, as this may lead to a serious injury due to airbag deployment.
NOTICE:
- Do not forcibly insert SST into the terminals of the connector when connecting SST.
- Insert SST straight into the terminals of the connector.
SST: 09843-18061
(e) Connect the negative (-) terminal cable to the battery, and wait for at least 2 seconds.
(f) Turn the ignition switch ON, and wait for at least 60 seconds.
(g) Clear the DTCs DTC Check / Clear.
(h) Turn the ignition switch OFF.
(i) Turn the ignition switch ON, and wait for at least 60 seconds.
(j) Check for DTCs DTC Check / Clear.
Result
HINT: Codes other than DTC B1820, B1821, B1822, B1823 maybe output at this time, but they are not related to this check.
D -- REPLACE FRONT SEATBACK ASSEMBLY LH
C -- REPLACE FRONT SEATBACK ASSEMBLY LH
B -- REPLACE FRONT SEATBACK ASSEMBLY LH
A -- Continue to next step.
2. CHECK FLOOR WIRE (SIDE SQUIB LH CIRCUIT)
(a) Turn the ignition switch OFF.
(b) Disconnect the negative (-) terminal cable from the battery, and wait for at least 90 seconds.
(c) Disconnect SST from connector C.
(d) Disconnect the connectors from the center airbag sensor.
(e) Connect the negative (-) terminal cable to the battery, and wait for at least 2 seconds.
(f) Turn the ignition switch ON.
(g) Measure the voltage according to the value(s) in the table below.
Standard voltage:
(h) Turn the ignition switch OFF.
(i) Disconnect the negative (-) terminal cable from the battery, and wait for at least 90 seconds.
(j) Measure the resistance according to the value(s) in the table below.
Standard resistance:
(k) Release the activation prevention mechanism built into connector B Diagnosis System.
(l) Measure the resistance according to the value(s) in the table below.
Standard resistance:
NG -- REPLACE FLOOR WIRE
OK -- Continue to next step.
3. CHECK CENTER AIRBAG SENSOR
(a) Connect the connectors to the front seat side airbag LH and the center airbag sensor.
(b) Connect the negative (-) terminal cable to the battery, and wait for at least 2 seconds.
(c) Turn the ignition switch ON, and wait for at least 60 seconds.
(d) Clear the DTCs DTC Check / Clear.
(e) Turn the ignition switch OFF.
(f) Turn the ignition switch ON, and wait for at least 60 seconds.
(g) Check for DTCs DTC Check / Clear.
Result
HINT: Codes other than DTC B1820, B1821, B1822, B1823 maybe output at this time, but they are not related to this check.
B -- REPLACE CENTER AIRBAG SENSOR ASSEMBLY
A -- REPLACE CENTER AIRBAG SENSOR ASSEMBLY
C -- USE SIMULATION METHOD TO CHECK