B1652

DTC B1651 CRASH RECORDED SIDE AIRBAG FRONT - DRIVER

DTC B1652 CRASH RECORDED SIDE AIRBAG FRONT - PASSENGER

GENERAL DESCRIPTION
SRSCM (Supplement Restraint System Control Module) decides to deploy the airbag module by sensing the frontal impact sensed by the sensor built in to the SRSCM.

1. DC/DC convertor : The DC/DC convertors of the power supply includes a step up and a step down converter, which provides the firing voltage for four firing circuits and the internal operating voltage. If the internal operating voltage falls below a defined threshold, a reset is executed.

2. Arming sensor/safing sensor : The arming/safing sensor built in to the airbag firing circuit has the function of arming the airbag circuit under all required deployment conditions and maintaining the airbag firing circuits unarmed under normal driving conditions. The safing sensor is a dual-contact electromechanical switch which closes if it experiences a deceleration exceeding specified threshold

3. Back-up power : The SRSCM reserves an energy supply to provide deployment energy far a short second when the vehicle voltage is low or if lost in vehicle frontal crash.

4. Malfunction detection : The SRSCM continuously monitors the current SRS operation status while the ignition key is turned on and detects possible malfunction of the system. The malfunction can be displayed in the form of a diagnostic trouble code using Hi-Scan.

5. MIL (Malfunction Indication Lamp) notification : If any fault is detected, the SRSCM sends a signal to the indicator lamp on the cluster to warm the vehicle driver. The MIL indicator is the key item in notifying the driver of SRS faults. Verify lamp and SRSCM operation by flashing 6 times when the ignition switches first turned on.

6. Malfunction recording : Once a fault occurs in the system, the SRSCM records the fault in the memory in the form of DTC and the DTC can only be erased only by Hi-Scan.

7. Data link connector : Data stored in he SRSCM memory is read by Hi-Scan through the data link connector.

8. After firing the airbags once, the SRSCM cannot be used again and must be replaced.

9. Crash output : The crash output is used to control an external device which will unlock the doors in case of a crash event. The crash output is specified as follows : 0-200 micro A in OFF mode and 200 mA in ON mode. In case of the unlock command the switch is closed for 200 mS.

DTC DESCRIPTION
The frontal Crash recorded in the SRS Control module.

DTC Detecting Condition:

INSPECTION PROCEDURE
1. Ignition "OFF", connect scantool.
2. Ignition "ON" & engine "OFF", select "Diagnostic Trouble Codes (DTCs)" mode.
3. Monitor diagnostic trouble code and present of trouble code.
4. Using a scan tool, clear the DTCs.
5. Is DTC present problem?

YES - The side crash is recorded. Replace SRS Control Module assy. And then go to next step.

NO - System is OK at this moment.

VERIFICATION OF VEHICLE REPAIR
After a repair, it is essential to verify that the fault has been corrected.
1. Connect scan tool and select "Diagnostic Trouble Codes (DTCs)" mode.
2. Using a scan tool, clear the DTCs.
3. Operate the vehicle within DTC Enable conditions in General information.
4. Are any DTCs present?

YES - Go to the applicable troubleshooting procedure.

NO - System is performing to specification at this time.