On Board Diagnosis Function

DIAGNOSIS SYSTEM (AIRBAG)

On Board Diagnosis Function


ON-BOARD DIAGNOSIS

There are two self diagnosis functions with air bag warning lamp per the following items.
- USER MODE
- DIAGNOSIS MODE

METHOD OF STARTING

- Diagnosis mode changes from user mode to diagnosis mode when changing operation is performed.
- In user mode, when SRS air bag warning lamp is not blinking, changing to diagnosis mode by ignition switch operation is not possible.
- In diagnosis mode, when repair is complete and system is normal, the mode changes to user mode when ignition switch is turned from OFF to ON.
Procedure to Change Diagnosis Mode
1.Turn ignition switch from OFF to ON.
2.SRS air bag lamp turns ON for 7 second and turns OFF, then turn ignition switch OFF within 2 second after the lamp turns OFF.
3.After turning ignition switch OFF, wait for 3 seconds or more.
4.Repeat operation 1 to 3 for 2 times so that operation 1 to 3 is repeated for 3 times in total.
5.Turn ignition switch from OFF to ON. Diagnosis mode changes.

USER MODE

In USER MODE, air bag warning lamp on combination meter blinks when a malfunction is detected and warns the customer (driver).
How to Read Air Bag Warning Lamp
1.Turn the ignition switch from OFF to ON, and check that the air bag warning lamp blinks.
2.Compare the air bag warning lamp blinking pattern with the examples.
Air Bag Warning Lamp Examples






Occurrence of Intermittent Malfunction
Air bag warning lamp blinks in user mode when an intermittent malfunction occurs. Air bag warning lamp turns
OFF when system returns to normal status.
Battery Low Voltage Detection
Air bag diagnosis sensor unit warns the driver by turning air bag warning lamp ON when air bag diagnosis sensor unit detects battery low voltage. Air bag warning lamp turns ON when a voltage value at which air bag diagnosis sensor unit cannot operate normally (9 V or less) is detected for 10 seconds or more. After starting to turn ON, air bag warning lamp turns OFF when air bag diagnosis sensor unit detects the normal value of battery voltage for 10 seconds or more.
The mode cannot be switched to diagnosis mode by ignition switch while air bag warning lamp turns ON due to this cause.
Battery High Voltage Detection
Air bag diagnosis sensor unit warns the driver by turning air bag warning lamp ON when air bag diagnosis sensor unit detects battery low voltage. Air bag warning lamp turns ON when a voltage value at which air bag diagnosis sensor unit cannot operate normally (16 V or more) is detected for 3 seconds or more. After starting to turn ON, air bag warning lamp turns OFF when air bag diagnosis sensor unit detects the normal value of battery voltage for 3 seconds or more.
The mode cannot be switched to diagnosis mode by ignition switch while air bag warning lamp turns ON due to this cause.

DIAGNOSIS MODE

The diagnosis mode can only be switched when a malfunction is detected in the user mode. Malfunctioning system is indicated according to blinking pattern of air bag warning lamp.
How to Read Air Bag Warning Lamp
1.Follow the procedures of "PROCEDURE TO CHANGE DIAGNOSIS MODE", and switch to the diagnosis mode.
2.Turn ignition switch ON. Check the blinking pattern of air bag warning lamp.
There are 4 blinking patterns for the air bag warning lamp as per the following items.
- Front air bag system: Two 1.5 second blinks followed by a 0.5 second blink repeated.
- Side air bag system: Three 1.5 second blinks followed by a 0.5 second blink repeated.
- Air bag control unit system: 3 second blink followed by a 0.5 second blink repeated.
- Sensor system: Two 3 second blinks followed by a 0.5 second blink repeated.
Front air bag system





Side air bag system





Air bag control unit system





Sensor system






EXAMPLE OF AIR BAG WARNING LAMP OPERATION IN THE DIAGNOSIS MODE

System Normal
When system is normal.





Single System Malfunction
- Front air bag system
When driver air bag module (Item display) is malfunctioning.





- Side air bag system
When side air bag module LH (Item display) is malfunctioning.





- Air bag control unit system
When air bag diagnosis sensor unit (Item display) is malfunctioning.





- Sensor system
When crash zone sensor (Item display) is malfunctioning.





Multiple Systems Malfunction
- Front air bag system
When driver air bag module (Item display 1) and passenger air bag module (Item display 2) are malfunctioning.





- Side air bag system
When side air bag module LH (Item display 1) and side air bag module LH (Item display 2) are malfunctioning.





- Air bag control unit system
When air bag diagnosis sensor unit (Item display 1) and front passenger air bag indicator (Item display 2)
are malfunctioning.





- Sensor system
When crash zone sensor (Item display 1) and B-pillar satellite sensor LH (Item display 2) are malfunctioning.





- Sensor system and front air bag system
When crash zone sensor system (Item display 1) and driver air bag module (Item display 2) are malfunctioning.