warning light TOYOTA TERCEL 1996 Service User Guide

W00708
A6 L
Battery 2Motor
RelayABS ECU
R-L W-BL
L
A7
A7
1
6
A7
A7
4
A75 1
3
A6
Solenoid
Relay
ABS ECU
ABS ECU W-B
W-B
EA
ABS Control Relay
DLC1
22
EB
ABS ActuatorEA110 13IC2 1E
Y
23
Short Pin
A5
4
ABS ECU Y
EA1R-L R-L
R-LR-L
R-L
1 Driver Side J/B
C7
C8 7
GAUGE
Light ABS Warning 1
3
ABS ECU
A1218
WA12 V
L-R DI-138
- DIAGNOSTICSANTI-LOCK BRAKE SYSTEM
1996 TERCEL (RM440U)
ABS Warning Light Circuit
CIRCUIT DESCRIPTION
If the ECU detects trouble, it lights the ABS warning light while at the same time prohibiting ABS control. At
this time, the ECU records a DTC in memory.
After removing the short pin of the DLC1, connect between terminals Tc and E
1 of the DLC1 to make the
ABS warning light blink and output the DTC.
WIRING DIAGRAM
DI4LZ-02

F00412
Continuity
Open A6
A7
(-)
(+)
1
62
3
45
Continuity
1
62
5 3 1 2
3 4
4 5
A7
A6Continuity
Open
(+) (-)A7
- DIAGNOSTICSANTI-LOCK BRAKE SYSTEM
DI-139
1996 TERCEL (RM440U)
INSPECTION PROCEDURE
Troubleshooting in accordance with the chart below for each trouble symptom.
ABS warning light does not light upGo to step 1
ABS warning light remains onGo to step 3
1 Check ABS warning light.
See Combination Meter Troubleshooting on page BE-2.
NG Replace bulb or combination meter assembly.
OK
2 Check ABS control relay.
PREPARATION:
Disconnect the connectors from the control relay.
CHECK:
Check the continuity between each terminal of the ABS control
relay.
OK:
Terminals A7-1 and A6-3Continuity
(Reference value 80 W)
Terminals A7-5 and A7-6Continuity
Terminals A7-2 and A7-5Open
CHECK:
(a) Apply battery voltage between terminals A7-1 and A6-3.
(b) Check the continuity between each terminal of the ABS
control relay.
OK:
Terminals A7-5 and A7-6Open
Terminals A7-2 and A7-5Continuity
CHECK:
Connect the
test lead to terminal of A7-4 and the  lead to
terminal A7-5. Check the continuity between the terminals.
OK:
Continuity
If there is no continuity, connect the  test lead to terminal A7-4
and the
lead to terminal A7-5. Recheck continuity between
the terminals.
NG Replace ABS control relay.
OK

DI-140
- DIAGNOSTICSANTI-LOCK BRAKE SYSTEM
1996 TERCEL (RM440U)
Repair or replace and check for open in harness and connector between DLC1 and ABS control
relay and body ground (See page IN-26).
3 Is DTC output?
Check DTC on page DI-1 11.
YES Repair circuit indicated by code output.
NO
4 Does ABS warning light go off if short pin is removed?
NO Check for short in harness and connector be-
tween warning light and DLC1 and ECU (See
page IN-26).
YES
5 Check ABS control relay (See step 2).
NG Replace ABS control relay.
OK
Repair or replace and check for short in harness and connector between DLC1 and ABS control
relay (See page IN-26).

R12884
SRS ECU
A1212 V
EA14
Tc
E
1
J/C
A A
DLC111
EC
BR
Tc
325
P-B P-B P-BABS ECU
J1
BR
R13006
TcE1
DLC1
- DIAGNOSTICSANTI-LOCK BRAKE SYSTEM
DI-141
1996 TERCEL (RM440U)
Tc Terminal Circuit
CIRCUIT DESCRIPTION
Connecting between terminals Tc and E1 of the DLC1 cause the ECU to display the DTC by flashing the ABS
warning light.
WIRING DIAGRAM
INSPECTION PROCEDURE
1 Check voltage between terminals Tc and E1 of DLC1.
CHECK:
(a) Turn the ignition switch ON.
(b) Measure the voltage between terminals Tc and E
1 of the
DLC1.
OK:
Voltage: 10 - 14 V
OK If ABS warning light does not blink even after Tc
and E
1 are connected, ECU may be defective.
NG
DI4M0-02

F00414
24ABS ECU
AA123DLC1
Ts
16
EC
E1TsL
B-RAEA13
B-RL12 V
J/C
J1
R13006
E1
DLC1
Tc
- DIAGNOSTICSANTI-LOCK BRAKE SYSTEM
DI-143
1996 TERCEL (RM440U)
Ts Terminal Circuit
CIRCUIT DESCRIPTION
The sensor check circuit detects abnormalities in the speed sensor signal which cannot be detected with
the DTC check.
Connecting terminals Ts and E
1 of the DLC1 in the engine compartment starts the check.
WIRING DIAGRAM
INSPECTION PROCEDURE
1 Check voltage between terminals Ts and E1 of DLC1.
CHECK:
(a) Turn the ignition switch ON.
(b) Measure the voltage between terminals Ts and E
1 of the
DLC1.
OK:
Voltage: 10 - 14 V
OK If ABS warning light does not blink even after Ts
and E
1 are connected, ECU may be defective.
NG
DI4M1-02

DI4M4-01
Vehicle Brought to Workshop
Customer Problem Analysis
Warning Light Check
DTC Check and Recording
Malfunction Code Clearance DI-148
DI-151
Circuit Inspection
Remains on
Malfunction Code
Symptom Simulation
DTC Check
DI-155
Identification of Problem
Normal Code
Confirmation Test
Does Not Light Up
END
1
2
3
4
7
Repair 856
Step
:Diagnostic steps permitting the use
of the TOYOTA hand-held tester.
DI-147
DI-148
DI-148
DI-148
DI-148
Malfunction Code
DTC Chart
DI-151
DTC Check and Recording
129
DI-148 Malfunction Code Clearance
10
11
Normal Code
Normal
Code
Malfunction CodeNormal
Code
,, , , , , 345101112
Malfunction Code
DI-146
- DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
320 Author
: Date
:
1996 TERCEL (RM440U)
SUPPLEMENTAL RESTRAINT SYSTEM
HOW TO PROCEED WITH TROUBLESHOOTING
Perform troubleshooting in accordance with the procedure on the following pages.

DI4M5-01
Supplemental Restraint System Check Sheet
Date Problem Dist Occurred
Customer 's Name
Registration No.
Registration Year
Frame No.
Odometer Reading
Weather
Temperature
Vehicle Operation
Road Conditions
Details Of Problem
Vehicle Inspection, Repair History
Prior to Occurrence of Malfunction
(Including Supplemental Restraint
System)
Diagnosis System Inspection
SRS Warning Light
Inspection
DTC Inspection1st Time
2nd Time
1st Time
2nd TimeInspector 's
Name
Fine Cloudy Rainy Snowy Other
Approx.
Starting Idling
Driving [ Constant speed Acceleration Deceleration
Other ]
Remains ON Sometimes Light Up Does Not Light Up
Remains ON Sometimes Light Up
Does Not Light Up
Normal Code Malfunction Code
Normal Code Malfunction Code[ Code. ]
[ Code. ]km
Miles //
//
// Date Vehicle Brought In
- DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
DI-147
1996 TERCEL (RM440U)
CUSTOMER PROBLEM ANALYSIS CHECK

N12151
DI95N-01
R13006
E1
Tc
AT0716
Normal Code
ON
OFF0.25
0.25
DI-148
- DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
1996 TERCEL (RM440U)
PRE-CHECK
1. SRS WARNING LIGHT CHECK
(a) Turn the ignition switch to ACC or ON and check that the
SRS warning light lights up.
(b) Check that the SRS warning light goes out after approx.
6 seconds.
HINT:

When the ignition switch is at ACC or ON and the SRS
warning light remains on or flashes, the airbag sensor as-
sembly has detected a malfunction code.

If, after approx. 6 seconds have elapsed, the SRS warn-
ing light sometimes lights up or the SRS warning light
lights up even when the ignition switch is OFF, a short in
the SRS warning light circuit can be considered likely.
Proceed to ºSRS warning light system malfunctionº on
page DI-180, DI-182.
2. DTC CHECK (Using diagnosis check wire)
(a) Output the DTC.
(1) Turn the ignition switch to the ACC or ON position
and wait approx. 20 seconds.
(2) Using SST, connect terminals Tc and E1 of the
DLC1.
SST 09843-18020
NOTICE:
Never make a mistake with the terminal connection posi-
tion as this will cause a malfunction.
(b) Read the DTC.
Read the 2-digit DTC as indicated by the number of times
the SRS warning light blinks. As an example, the blinking
patterns, normal, 11 and 31 are as shown on the illustra-
tion.

Normal code indication.
The light will blink 2 times per second.

Malfunction code indication.
The first blinking output indicates the first digit
of a 2-digit DTC. After a 1.5 second pause,
the second blinking output will indicate the
second digit.

H01461H04911
H05581
ABTerminal
Tc
ABOFF
Body
Ground
OFF
ON
OFF
Several
Seconds50 m sec.
50 m sec.
1 second
(± 0.5 sec.)
Tc
Body
Ground
1 second
(± 0.5 sec.)
1
23
45
N12278
DI-150
- DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
1996 TERCEL (RM440U)
4. DTC CLEARANCE (Using diagnosis check wire)
(a) Connect the 2 service wires to terminals Tc and AB of
DLC1.
(b) Turn the ignition switch to ACC or ON and wait approx. 6
seconds.
(c) Starting with the Tc terminal, apply body ground alternate-
ly to terminal Tc and terminal AB twice each in cycles of
1.0 seconds. Confirm that body ground is absolute. Final-
ly, keep applying body ground to terminal Tc.
HINT:
When alternately grounding terminals Tc and AB, release
ground from one terminal and immediately apply it to the other
terminal within an interval of 0.2 seconds. If DTCs do not clear,
repeat the above procedure until the codes are cleared.
(d) Several seconds after doing the clearing procedure, the
SRS warning light will blink in a 50 m sec. cycle to indicate
the codes have been cleared.
5. DTC CLEARANCE (Using TOYOTA hand-held tester)
(a) Hook up the TOYOTA hand-held tester to the DLC1.
(b) Clear the DTCs by following the prompts on the tester
screen.
HINT:
Please refer to the TOYOTA hand-held tester operator's manu-
al for further details.

DI4M7-02
- DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
DI-151
1996 TERCEL (RM440U)
DIAGNOSTIC TROUBLE CODE CHART
If a malfunction code is displayed during the DTC check, check the circuit listed for that code in the table
below (Proceed to the page given for that circuit.).
DTC No.
(See Page)Detection ItemTrouble AreaSRS
Warning Light
Nl
System normal-OFFNormal
(DI-177)
Source Voltage drop
Battery

Airbag sensor assemblyON
11
(DI-155)

Short in squib circuit (to ground)
Steering wheel pad (D squib)

Front passenger airbag assembly (P squib)

Spiral cable

Airbag sensor assembly

Wire harness
ON
12
(DI-162)

Short in squib circuit (to B+)
Steering wheel pad (D squib)

Front passenger airbag assembly (P squib)

Spiral cable

Airbag sensor assembly

Wire harness
ON
14
(DI-168)

Open in D squib circuit
Steering wheel pad (D squib)

Spiral cable

Airbag sensor assembly

Wire harness
ON
31
(DI-172)
Airbag sensor assembly malfunction
Airbag sensor assemblyON
54
(DI-174)
Open in P squib circuit
Front passenger airbag assembly (P squib)

Airbag sensor assembly

Wire harness
ON
HINT:

When the SRS warning light remains lit up and the DTC is the normal code, this means a source voltage
drops.
This malfunction is not stored in memory by the airbag sensor assembly and if the power source volt-
age returns to normal, the SRS warning light will automatically go out.

When 2 or more codes are indicated, the codes will be displayed in numeral order starting from the
lowest numbered code.

If a code not listed on the chart is displayed, the airbag sensor assembly is faulty.