ON-BOARD DIAGNOSTIC SYSTEM FUNCTION

On-board Diagnostic Function

DTC reading/clearing (past malfunction indication)

• When the ignition switch is turned to the ON position, the SAS control module detects intermittent DTCs and module DTCs, and stores them in memory. The method for the DTCs from SAS control module has adopted a time-out control for determining the existence of malfunctions in the system. For the SAS control module to detect a malfunction, it is necessary for the malfunction to be present in the system for 1 min or more. For the SAS control module to determine that a malfunction has been cleared, a malfunction cannot present for 1 min or more. The actual time for the malfunction detection time-out differs according to each DTC. DTCs can be searched using the WDS or equivalent. The DTC that is stored in the SAS control module is displayed on the WDS or equivalent together with a simple definition of the DTC. If there are no DTCs stored, the WDS or equivalent displays "PASS-SAS CONTROL MODULE". If malfunctions have been cleared, the WDS or equivalent can be used to clear DTCs from the memory of the SAS control module. Once 254 ignition switch operations have been recorded since a malfunction was last detected, DTCs will automatically be removed from memory. Once cleared, DTCs cannot be re-displayed, therefore record displayed DTCs before performing the clearing procedure. Malfunction DTCs can be redisplayed after performing the DTC clearing operation because DTCs cannot be cleared from the SAS control module.

Reading DTCs (present malfunction indication)

• The self test option is used to confirm that no electrical malfunctions exist in the air bag system. Upon entering the self test, the SAS control module will perform an electrical check of each electrical component in the system. If a concern is detected, a DTC is displayed on the WDS or equivalent with a brief description of the DTC. Malfunctions detected during the self test are not stored in memory unless the same malfunction was also detected during normal vehicle operation. The self test should always be performed after any repair to confirm that the repair was successful. To run the self test, connect the WDS or equivalent to the data link connector-2 (DLC-2), and follow the instructions on the WDS or equivalent display. The SAS control module will run the self-test and display present malfunction DTCs on the screen.

Fail-safe function

• If the SAS control module performance/function cannot be maintained due to any cause, the fail-safe function stops air bag system control and flashes the air bag system warning light to prevent the air bags from operating (deploying) accidentally.

Memory function

• Stores malfunctions in the air bag system-related parts detected by the malfunction detection function, and the stored malfunction contents are not cleared even if the ignition switch is turned to the LOCK position or the negative battery cable is disconnected.

DTC table

DTC				System malfunction location
WDS or equivalent display	Air bag system warning light
	Flashing pattern		Priority ranking
B1231	19		3	SAS control module activation (deployment) control frequency error
B1342	24		2	SAS control module internal malfunction
B1869	-	Warning sound	30	Air bag system warning light operation malfunction
B1870			31	Air bag system warning light circuit short to power supply
B1877	46		26	Driver-side pre-tensioner front buckle circuit resistance high
B1878	17		30	Driver-side pre-tensioner front buckle circuit short to power supply
B1879				Driver-side pre-tensioner front buckle circuit short to body ground
B1881	47		26	Passenger-side pre-tensioner front buckle circuit resistance high
B1882	18		31	Passenger-side pre-tensioner front buckle circuit short to power supply
B1883				Passenger side pre-tensioner front buckle circuit short to body ground
B1885	46		26	Driver-side pre-tensioner front buckle resistance low
B1886	47		27	Passenger-side pre-tensioner front buckle circuit resistance low
B1887	15		6	Driver-side air bag module circuit short to body ground
B1888	16		7	Passenger side air bag module circuit short to body ground
B1891	-	Warning sound	29	Air bag warning sound circuit short to power supply
B1892			28	Air bag warning sound short to body ground
B1916	15		8	Driver-side air bag module circuit short to power supply
B1921	21		4	SAS control module ground bracket resistance high
B1925	16		9	Passenger-side air bag module circuit short to power supply
B1932	32		10	Driver-side air bag module circuit resistance high
B1933	33		11	Passenger-side air bag module circuit resistance high
B1934	34		12	Driver-side air bag module circuit resistance low
B1935	35		13	Passenger-side air bag module circuit resistance low
B1992	36		21	Driver-side side air bag module circuit short to power supply
B1993			20	Driver-side side air bag module circuit short to body ground
B1994			22	Driver-side side air bag module circuit resistance high
B1995			23	Driver-side side air bag module circuit resistance low
B1996	37		25	Passenger-side side air bag module circuit short to power supply
B1997			24	Passenger-side side air bag module circuit short to body ground
B1998			26	Passenger-side side air bag module circuit resistance high
B1999			27	Passenger-side side air bag module circuit resistance low
B2440	43		17	Passenger-side side air bag sensor installation malfunction
B2441	42		16	Driver-side side air bag sensor installation malfunction
B2444	48		14	Driver-side side air bag sensor (internal circuit abnormal)
B2445	49		15	Passenger-side side air bag sensor (internal circuit abnormal)
C1414	29		5	Vehicle identification code error
U2017	44		18	Driver-side side air bag sensor (communication error)
U2018	45		19	Passenger-side side air bag sensor (communication error)

PID/Data Monitor Function

PID/data monitor table

Active Command Mode Function

Active command mode table