TOYOTA SUPRA 1997 Service Repair Manual
Page 861 of 1807
R05899R14301H07912
P squib
Spiral
CableAirbag Sensor
Assembly
D squib
D+
DI-570
- DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
798 Author: Date:
1997 SUPRA (RM502U)
7 Check spiral cable.
PREPARATION:
Disconnect the connector between airbag sensor assembly
and spiral cable.
CHECK:
Measure the resistance between D+ on spiral cable side of con-
nector between spiral cable and steering wheel pad and body
ground.
OK:
Resistance: 1 MW or higher
NG Repair or replace spiral cable.
OK
Repair or replace harness or connector be-
tween airbag sensor assembly and spiral
cable.
Page 862 of 1807
AB0119R05901R14288H07913
P squib
Spiral
CableAirbag Sensor
Assembly
D squib
ON
- DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
DI-571
799 Author: Date:
1997 SUPRA (RM502U)
DTC 12 Short in Squib Circuit (to B+)
CIRCUIT DESCRIPTION
The squib circuit consists of the airbag sensor assembly, spiral cable, steering wheel pad and front passen-
ger airbag assembly. It causes the SRS to deploy when the SRS deployment conditions are satisfied.
For details of the function of each component, see FUNCTION OF COMPONENTS on page RS-2.
DTC 12 is recorded when a B+ short is detected in the squib circuit.
DTC No.DTC Detecting ConditionTrouble Area
12
Short circuit in squib wire harness (to B+).
Squib malfunction.
Spiral cable malfunction.
Airbag sensor assembly malfunction.Steering wheel pad (D squib)
Front passenger airbag assembly (P squib)
Spiral cable
Airbag sensor assembly
Wire harness
WIRING DIAGRAM
Refer to page DI-564 for the WIRING DIAGRAM.
INSPECTION PROCEDURES
1 Preparation (See step 1 on page DI-595).
2 Check D squib circuit.
CHECK:
For the connector (on the spiral cable side) between the spiral
cable and steering wheel pad, measure the voltage between D
+
and body ground.
OK:
Voltage: 0 V
NG Go to step 7.
OK
DI4WL-01
Page 863 of 1807
AB0119R05898R14288H07914
P squib
Spiral
CableAirbag Sensor
Assembly
D squib
ON
P
+
(+)
(-)
DI-572
- DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
800 Author: Date:
1997 SUPRA (RM502U)
3 Check P squib circuit.
CHECK:
For the connector (on the airbag sensor assembly side) be-
tween airbag sensor assembly and front passenger airbag as-
sembly, measure the voltage between P
+ and body ground.
OK:
Voltage: 0 V
NG Repair or replace harness or connector be-
tween the airbag sensor assembly and front
passenger airbag assembly.
OK
Page 864 of 1807
AB0069R05902AB0069AB0118AB0119FI1389N19819H07915
P squibAirbag Sensor
Assembly
D squib
Spiral
Cable
ACC
ON
or
E
1
Tc DLC1
Code 12
P+P-
D+D-
- DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
DI-573
801 Author: Date:
1997 SUPRA (RM502U)
4 Check airbag sensor assembly.
PREPARATION:
(a) Connect the connector to airbag sensor assembly.
(b) Using a service wire, connect D
+ and D- on spiral cable
side of connector between spiral cable and steering
wheel pad.
(c) Using a service wire, connect P
+ and P- on airbag sensor
assembly side of connector between airbag sensor as-
sembly and front passenger airbag assembly.
(d) Connect negative (-) terminal cable to battery, and wait
at least 2 seconds.
CHECK:
(a) Turn the ignition switch to ACC or ON and wait at least 20
seconds.
(b) Clear malfunction code stored in memory.
(See page DI-557)
(c) Turn the ignition switch to LOCK, and wait at least 20 se-
conds.
(d) Turn the ignition switch to ACC or ON, and wait at least
20 seconds.
(e) Using SST, connect the terminals Tc and E
1 of DLC1.
SST 09843-18020
(f) Check DTC.
OK:
DTC 12 is not output.
HINT:
Codes other than code 12 may be output at this time, but they
are not relevant to this check.
+
NG Replace airbag sensor assembly.
OK
Page 865 of 1807
H03224
P squib
Spiral
CableAirbag Sensor
Assembly
D squib
ON ACC
DLC 1Code 12
Tc E
1
or
DI-574
- DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
802 Author: Date:
1997 SUPRA (RM502U)
5 Check D squib.
PREPARATION:
(a) Turn the ignition switch to LOCK.
(b) Disconnect negative (-) terminal cable from the battery,
and wait at least 90 seconds.
(c) Connect the steering wheel pad connector.
(d) Connect negative (-) terminal cable to battery, and wait
at least 2 seconds.
CHECK:
(a) Turn the ignition switch to ACC or ON, and wait at least
20 seconds.
(b) Clear malfunction code stored in memory.
(See page DI-557)
(c) Turn the ignition switch to LOCK, and wait at least 20 se-
conds.
(d) Turn the ignition switch to ACC or ON, and wait at least
20 seconds.
(e) Using SST, connect the terminals Tc and E
1 of DLC1.
SST 09843-18020
(f) Check DTC.
OK:
DTC 12 is not output.
HINT:
Codes other than code 12 may be output at this time, but they
are not relevant to this check.
NG Replace steering wheel pad.
OK
Page 866 of 1807
H03225
P squib
Spiral
CableAirbag Sensor
Assembly
D squib
ON ACC
DLC 1Code 12
Tc E
1
or
- DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
DI-575
803 Author: Date:
1997 SUPRA (RM502U)
6 Check P squib.
PREPARATION:
(a) Turn the ignition switch to LOCK.
(b) Disconnect negative (-) terminal cable from the battery,
and wait at least 90 seconds.
(c) Connect the front passenger airbag assembly connector.
(d) Connect negative (-) terminal cable to battery, and wait
at least 2 seconds.
CHECK:
(a) Turn the ignition switch to ACC or ON and wait at least 20
seconds.
(b) Clear malfunction code stored in memory.
(See page DI-557)
(c) Turn the ignition switch to LOCK, and wait at least 20 se-
conds.
(d) Turn the ignition switch to ACC or ON, and wait at least
20 seconds.
(e) Using SST, connect the the terminals Tc and E
1 of DLC1.
SST 09843-18020
(f) Check DTC.
OK:
DTC 12 is not output.
HINT:
Codes other than code 12 may be output at this time, but they
are not relevant to this check.
NG Replace front passenger airbag assembly.
OK
From the results of the above inspection, the malfunctioning part can now be considered normal.
To make sure of this, use the simulation method to check.
Page 867 of 1807
AB0119R05899R14288H07916
P squib
Spiral
CableAirbag Sensor
Assembly
D squibON
DI-576
- DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
804 Author: Date:
1997 SUPRA (RM502U)
7 Check spiral cable.
PREPARATION:
(a) Turn the ignition switch to LOCK.
(b) Disconnect the connector between airbag sensor assem-
bly and spiral cable.
(c) Turn the ignition switch ON.
CHECK:
Measure voltage at D+ on spiral cable side of connector be-
tween spiral cable and steering wheel pad and body ground.
OK:
Voltage: 0 V
NG Repair or replace spiral cable.
OK
Repair or replace harness or connector between airbag sensor assembly and spiral cable.
Page 868 of 1807
R16015
D squibSpiral
Cable1
2R
W7
6Airbag Sensor
Assembly
A34
A34
D-
D+
- DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
DI-577
805 Author: Date:
1997 SUPRA (RM502U)
DTC 13 Short in D Squib Circuit
CIRCUIT DESCRIPTION
The D squib circuit consists of the airbag sensor assembly, spiral cable and steering wheel pad.
It causes the airbag to deploy when the airbag deployment conditions are satisfied.
For details of the function of each component, see FUNCTION OF COMPONENTS on page RS-2.
DTC 13 is recorded when a short is detected in the D squib circuit.
DTC No.DTC Detecting ConditionTrouble Area
13
Short circuit between D+
wire harness and D- wire harness
of squib.
D squib malfunction.
Spiral cable malfunction.
Airbag sensor assembly malfunction.Steering wheel pad (D squib)
Spiral cable
Airbag sensor assembly
Wire harness
WIRING DIAGRAM
DI4WM-01
Page 869 of 1807
R05901R14286
H07917
P squib
Spiral
CableAirbag Sensor
Assembly
D squib
D-D+
(-) (+)
DI-578
- DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
806 Author: Date:
1997 SUPRA (RM502U)
INSPECTION PROCEDURES
1 Preparation (See step 1 on page DI-595).
2 Check D squib circuit.
PREPARATION:
Release airbag activation prevention mechanism on airbag
sensor assembly side of airbag squib connector.
(See page DI-557)
CHECK:
For the connector (on the spiral cable side) between the spiral
cable and steering wheel pad, measure the resistance between
D
+ and D-.
OK:
Resistance: 1MW or Higher
NG Go to step 5.
OK
Page 870 of 1807
H03227
P squib
Spiral
Cable D squibAirbag Sensor
Assembly
ACC
ON
or
DLC1
Code 13
E
1Tc
- DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
DI-579
807 Author: Date:
1997 SUPRA (RM502U)
3 Check airbag sensor assembly.
PREPARATION:
(a) Connect the connector to airbag sensor assembly.
(b) Connect negative (-) terminal cable to battery, and wait
at least 2 seconds.
CHECK:
(a) Turn the ignition switch to ACC or ON and wait at least 20
seconds.
(b) Clear malfunction code stored in memory.
(See page DI-557)
(c) Turn the ignition switch to LOCK, and wait at least 20 se-
conds.
(d) Turn the ignition switch to ACC or ON, and wait at least
20 seconds.
(e) Using SST, connect the terminals Tc and E
1 of DLC1.
SST 09843-18020
(f) Check DTC.
OK:
DTC 13 is not output.
HINT:
Codes other than code 13 may be output at this time, but they
are not relevant to this check.
NG Replace airbag sensor assembly.
OK