B1858

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:
* w/ Navigation System (for HDD):
After the power switch is turned OFF, the display and navigation module display (HDD navigation system) records various types of memory and settings. As a result, after turning the power switch OFF, be sure to wait for the time specified in the following table before disconnecting the cable from the negative (-) battery terminal.

Waiting Time before Disconnecting Cable from Negative (-) Battery Terminal:





* When disconnecting the cable, some systems need to be initialized after the cable is reconnected Repair Instruction - Initialization.

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 power 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 the 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 power switch ON (IG), and wait for at least 60 seconds.

(g) Clear the DTCs DTC Check / Clear.

(h) Turn the power switch OFF.

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

(j) Check for DTCs DTC Check / Clear.

OK:

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

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

Result





C -- REPLACE REAR SEAT SIDE AIRBAG ASSEMBLY LH Removal

B -- REPLACE REAR SEAT SIDE AIRBAG ASSEMBLY LH Removal

A -- REPLACE REAR SEAT SIDE AIRBAG ASSEMBLY LH Removal
D -- Continue to next step.

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





(a) Turn the power switch OFF.

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

(c) Disconnect SST from connector E.

(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 power switch ON (IG).

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

Standard voltage:





(h) Turn the power 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 -- CHECK REAR SEAT WIRE LH
OK -- Continue to next step.

3. 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 power switch ON (IG), and wait for at least 60 seconds.

(d) Clear the DTCs DTC Check / Clear.

(e) Turn the power switch OFF.

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

(g) Check for DTCs DTC Check / Clear.

OK:

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

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

NG -- REPLACE CENTER AIRBAG SENSOR ASSEMBLY Removal

OK -- USE SIMULATION METHOD TO CHECK Diagnosis System

4. 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 power switch ON (IG).

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

Standard voltage:





(e) Turn the power 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