Diagnostic Tests - Toyota RAV4 1999 Manual

Fig. 15: Releasing Shorting Spring
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

DIAGNOSTIC TESTS

WARNING: Failure to follow service precautions may result in air bag deployment and
personal injury. See SERVICE PRECAUTIONS . After component
replacement, check system operation. See SYSTEM OPERATION CHECK .
CAUTION: Ensure ignition switch is in LOCK position before disconnecting or
connecting negative battery cable. If ignition switch is in ACC or ON
position when negative battery cable is disconnected or connected, air
bag sensor may be damaged. To prevent damage to connector terminals,
DO NOT probe terminal ends. Instead, backprobe terminals (probe
terminal where wire enters harness connector).
NOTE: In the following tests, the term squib connector and module connector may be
used interchangeably.
AIR BAG WARNING LIGHT DOES NOT ILLUMINATE
Description
AIR BAG warning light is located in instrument cluster. When air bag system is normal, AIR BAG warning
light illuminates for about 6 seconds after ignition switch is turned from LOCK to ACC or ON position, and
turns off automatically. If a malfunction is present in air bag system, AIR BAG warning light illuminates to
inform operator of malfunction. When Data Link Connector 1 (DLC1) terminals Tc and E1 are connected
together, a Diagnostic Trouble Code (DTC) is displayed by flashing AIR BAG warning light.
Diagnostic Procedure
1. Remove SRS-B fuse and check continuity across fuse blades. SRS-B fuse is located in instrument panel
fuse block under left side of instrument panel. If fuse is faulty, go to step 4). If fuse is okay, reinstall fuse
and go to next step.
2. Disable air bag system. See DISABLING SYSTEM under DISABLING & ACTIVATING AIR BAG
SYSTEM. Reconnect negative battery cable. Turn ignition switch to ACC or ON position. Measure
voltage between ground and harness side of air bag sensor assembly connector C20, terminal No. 3
(circuit LA, Black/Yellow wire). See Fig. 16 . If 10-14 volts is not present, repair AIR BAG warning
light bulb or circuit. If 10-14 volts is present, go to next step.
3. Turn ignition switch to LOCK position. Disconnect negative battery cable. Reconnect 3 air bag sensor
assembly connectors. Leave air bag modules, pretensioners and front air bag sensors disconnected.
Reconnect negative battery cable and wait at least 2 seconds. Turn ignition switch to ACC or ON
position. If AIR BAG warning light illuminates, system operation is normal. If AIR BAG warning light
does not come on, check for poor connection at air bag sensor assembly connector C20, terminal No. 3
(Black/Yellow wire). If connection is okay, replace air bag sensor assembly.
1999 Toyota RAV4
AIR BAG RESTRAINT SYSTEM 1999 Toyota