B1620

SUPPLEMENTAL RESTRAINT SYSTEM: AIRBAG SYSTEM: B1620/21,B1622/81,B1625/22,B1627/82: Side Airbag Sensor RH Circuit Malfunction
B1627/82 - Lost communication with Side Airbag Sensor LH

DESCRIPTION

for DTC B1620 and B1625:

The side airbag sensor LH and RH consists of the safing sensor, the diagnostic circuit, the lateral deceleration sensor, etc.

If the center airbag sensor receives signals from the lateral deceleration sensor, it determines whether the SRS should be activated.

DTC B1620/21 or B1625/22 is recorded when a malfunction is detected in the side airbag sensor LH or RH circuit.

for DTC B1622 and B1627:

The circuit for the side collision sensor RH or LH (to determine deployment of the front seat side airbag RH or LH, rear seat side airbag RH or LH, and curtain shield airbag RH or LH) is composed of the center airbag sensor, side airbag sensor RH or LH, and rear airbag sensor RH or LH.

The side airbag sensor RH or LH, and rear airbag sensor RH or LH detect impacts to the vehicle and send signals to the center airbag sensor to determine if the airbag should be deployed.

DTC B1622 or B1627 is recorded when a malfunction is detected in the circuit for the side collision sensor RH or LH (to determine deployment of the front seat side airbag RH or LH, rear seat side airbag RH or LH, and curtain shield airbag RH or LH).





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.

PROCEDURE

1. CHECK FOR DTC

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

(b) Clear the DTCs stored in the memory DTC Check / Clear.

(c) Turn the power switch OFF.

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

(e) Check for DTCs DTC Check / Clear.

Result:





HINT
Codes other than DTC B1620, B1622, B1625 and B1627 maybe output at this time, but they are not related to this check.

B -- CHECK SIDE AIRBAG SENSOR LH

A -- USE SIMULATION METHOD TO CHECK Diagnosis System
C -- Continue to next step.

2. CHECK SIDE AIRBAG SENSOR RH





(a) Turn the power switch OFF.

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

(c) Interchange the side airbag sensor RH with LH and connect the connectors to them.

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

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

(f) Clear the DTCs stored in the memory DTC Check / Clear.

(g) Turn the power switch OFF.

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

(i) Check for DTCs DTC Check / Clear.

Result:





HINT
Codes other than DTC B1620, B1622, B1625 and B1627 may be output at this time, but they are not related to this check.

(j) Turn the power switch OFF.

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

(l) Return the side airbag sensor RH and LH to their original positions and connect the connectors to them.

B -- REPLACE CENTER AIRBAG SENSOR ASSEMBLY Removal

A -- USE SIMULATION METHOD TO CHECK Diagnosis System

C -- REPLACE SIDE AIRBAG SENSOR RH Removal

3. CHECK SIDE AIRBAG SENSOR LH





(a) Turn the power switch OFF.

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

(c) Interchange the side airbag sensor RH with LH and connect the connectors to them.

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

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

(f) Clear the DTCs stored in the memory DTC Check / Clear.

(g) Turn the power switch OFF.

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

(i) Check for DTCs DTC Check / Clear.

Result:





HINT
Codes other than DTC B1620, B1622, B1625 and B1627 may be output at this time, but they are not related to this check.

(j) Turn the power switch OFF.

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

(l) Return the side airbag sensor RH and LH to their original positions and connect the connectors to them.

B -- REPLACE SIDE AIRBAG SENSOR LH Removal

A -- USE SIMULATION METHOD TO CHECK Diagnosis System

C -- REPLACE CENTER AIRBAG SENSOR ASSEMBLY Removal