B1856

SUPPLEMENTAL RESTRAINT SYSTEM: AIRBAG SYSTEM: B1855/63-B1858/63: Short in Rear Side Squib LH Circuit
B1858/63 - Short to B+ in Rear Side Squib LH Circuit

DESCRIPTION

The rear side squib LH circuit consists of the center airbag sensor and the rear seat side airbag LH.

The circuit instructs the SRS to deploy when deployment conditions are met.

These DTCs are recorded when a malfunction is detected in the rear side squib LH circuit.





WIRING DIAGRAM





INSPECTION PROCEDURE

NOTICE:
After the engine switch is turned off, the HDD navigation system requires approximately 6 minutes to record various types of memory and settings. As a result, after turning the engine switch off, wait 6 minutes 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 REAR SEAT SIDE AIRBAG LH (REAR SIDE SQUIB LH)





(a) Turn the engine switch off.

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

(c) Disconnect the connector from the rear seat side airbag LH.

(d) Connect the red wire side of SST (resistance: 2.1 Ohms) to connector E.

CAUTION:
Never connect a tester to the rear seat side airbag LH (rear 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 engine switch on (IG), and wait for at least 60 seconds.

(g) Clear the DTCs Reading and Clearing Diagnostic Trouble Codes.

(h) Turn the engine switch off.

(i) Turn the engine switch on (IG), and wait for at least 60 seconds.

(j) Check for DTCs Reading and Clearing Diagnostic Trouble Codes.

OK:

DTC B1855, B1856, B1857, B1858 or 63 is not output.

HINT
Codes other than DTC B1855, B1856, B1857, B1858 and 63 may be output at this time, but they are not related to this check.

NG -- CHECK NO. 2 FLOOR WIRE (REAR SIDE SQUIB LH CIRCUIT)

OK -- REPLACE REAR SEAT SIDE AIRBAG ASSEMBLY LH Components

2. CHECK NO. 2 FLOOR WIRE (REAR SIDE SQUIB LH CIRCUIT)





(a) Turn the engine switch off.

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

(c) Disconnect SST (resistance: 2.1 Ohms) from the No. 2 floor wire.

(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 engine switch on (IG).

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

Standard voltage:





(h) Turn the engine 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:





OK -- CHECK CENTER AIRBAG SENSOR
NG -- Continue to next step.

3. CHECK REAR SEAT WIRE LH





(a) Disconnect the No. 2 floor wire connector from the rear seat wire LH.

(b) Connect the negative (-) terminal cable to the battery, and wait for at least 2 seconds.

(c) Turn the engine switch on (IG).

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

Standard voltage:





(e) Turn the engine switch off.

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

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

Standard resistance:





(h) Release the activation prevention mechanism built into connector D Diagnosis System.

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

Standard resistance:





NG -- REPLACE REAR SEAT WIRE LH

OK -- REPLACE NO. 2 FLOOR WIRE

4. CHECK CENTER AIRBAG SENSOR





(a) Connect the connectors to the rear 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 engine switch on (IG), and wait for at least 60 seconds.

(d) Clear the DTCs Reading and Clearing Diagnostic Trouble Codes.

(e) Turn the engine switch off.

(f) Turn the engine switch on (IG), and wait for at least 60 seconds.

(g) Check for DTCs Reading and Clearing Diagnostic Trouble Codes.

OK:

DTC B1855, B1856, B1857, B1858 or 63 is not output.

HINT
Codes other than DTC B1855, B1856, B1857, B1858 and 63 may be output at this time, but they are not related to this check.

NG -- REPLACE CENTER AIRBAG SENSOR ASSEMBLY Components

OK -- USE SIMULATION METHOD TO CHECK Diagnosis System