Toyota RAV4 1999 Manual page 27

AIR BAG WARNING LIGHT INTERMITTENT
If AIR BAG warning light comes on intermittently, perform following tests to simulate driving conditions. If
problem cannot be found, replace all components including wiring harness.
Wiggle-test wiring harness.

Apply heat to components with a hair dryer.

Spray water onto entire vehicle (not directly onto electrical components) to simulate humidity.

DTCS NOT DISPLAYED
NOTE: Use following procedure if DTCs are not displayed or air bag warning light stays
on when jumper wire is connected between terminals Tc and E1 of DLC1.
Description
When DLC1 terminals Tc and E1 are connected together, air bag sensor assembly is set in Diagnostic Trouble
Code (DTC) output mode. DTC is displayed by flashing AIR BAG warning light.
Diagnostic Procedure
1. Turn ignition switch from LOCK to ACC or ON position. If AIR BAG warning light does not illuminate
for about 6 seconds, repair AIR BAG warning light circuit. See WIRING DIAGRAMS . If AIR BAG
warning light illuminates for about 6 seconds, go to next step.
2. Measure voltage between DLC1 terminals Tc and E1. See Fig. 14 . If 10-14 volts is present, go to step 4).
If 10-14 volts is not present, go to next step.
3. Measure voltage between ground and DLC1 terminal Tc. If 10-14 volts is present, repair harness between
ground and DLC1 terminal E1. See WIRING DIAGRAMS . If 10-14 volts is not present, go to next
step.
4. Turn ignition switch to LOCK position. Disconnect negative battery cable and wait at least 90 seconds.
Access and disconnect air bag sensor assembly connector C20 (center connector). See AIR BAG
SENSOR ASSEMBLY under REMOVAL & INSTALLATION . Connect one end of jumper wire to
harness side of air bag sensor assembly connector C20, terminal No. 19 (Circuit Tc, Pink/Black wire).
See Fig. 16 . Leave other end of jumper wire disconnected. Reconnect air bag sensor assembly connector
with jumper wire connected. Connect negative battery cable and turn ignition switch to ACC or ON
position. Wait at least 20 seconds. Connect unconnected end of jumper wire to ground. If AIR BAG
warning light does not illuminate, replace air bag sensor assembly. If AIR BAG warning light illuminates,
check Pink/Black wire between air bag sensor assembly and DLC1.
DTCS CONTINUOUSLY DISPLAYED
NOTE: Use following procedure if DTCs are displayed without connecting jumper wire
between terminals Tc and E1 of DLC1.
Description
1999 Toyota RAV4
AIR BAG RESTRAINT SYSTEM 1999 Toyota