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TC Terminal Circuit

This document provides diagnostic procedures for the supplemental restraint system (SRS) circuit. It describes the circuit, which uses the TC and CG terminals of the DLC3 to output diagnostic trouble codes (DTCs) by blinking the SRS warning light. The procedures check the wiring harness between the DLC3 and airbag sensor assembly center for a resistance below 1 ohm, and between the DLC3 CG terminal and body ground for a resistance below 1 ohm. It also checks the resistance between the airbag sensor assembly center TC terminal and body ground, which should be 1 megohm or higher.

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Phang Kumwing
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232 views3 pages

TC Terminal Circuit

This document provides diagnostic procedures for the supplemental restraint system (SRS) circuit. It describes the circuit, which uses the TC and CG terminals of the DLC3 to output diagnostic trouble codes (DTCs) by blinking the SRS warning light. The procedures check the wiring harness between the DLC3 and airbag sensor assembly center for a resistance below 1 ohm, and between the DLC3 CG terminal and body ground for a resistance below 1 ohm. It also checks the resistance between the airbag sensor assembly center TC terminal and body ground, which should be 1 megohm or higher.

Uploaded by

Phang Kumwing
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
Available Formats
Download as PDF, TXT or read online on Scribd
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05–590

DIAGNOSTICS – SUPPLEMENTAL RESTRAINT SYSTEM (April, 2003) 055ZW–05

TC TERMINAL CIRCUIT

CIRCUIT DESCRIPTION
DTC output mode is set by connecting between TC and CG of the DLC3.
The DTCs are displayed by blinking the SRS warning light.
WIRING DIAGRAM

D1
Airbag Sensor Assy Center
DLC3
Center J/B Instrument Panel J/B
3 5 4 1 19
P–B P–B P–B
Tc 4C 4C IJ II A13 Tc
13
16 21
W–B W–B
CG 4B 4B
4

A
J6
JC

IE

H42006

HINT:
When each warning light stays blinking, ground short in the wiring until the terminal TC of the DLC3 or internal
ground short in each ECU is suspected.

2004 COROLLA (RM1037U)

Author: Date: 755


05–591
DIAGNOSTICS – SUPPLEMENTAL RESTRAINT SYSTEM (April, 2003)

INSPECTION PROCEDURE
1 CHECK WIRE HARNESS(DLC3 – AIRBAG SENSOR ASSY CENTER)

DLC3: (a) Turn the ignition switch to the LOCK position.


TC
(b) Disconnect the aribag sensor assy center connector.
(c) Measure the resistance according to the value(s) in the
table below.
Standard:
Tester connection Condition Specified condition
TC – TC Always Below 1 Ω

Airbag Sensor Assy Center:

TC
NG REPAIR OR REPLACE WIRE HARNESS(TC of
ELC3 – TC of AIRBAG SENSOR ASSY CENTER)
H40173
H40065 H43360

OK

2 CHECK WIRE HARNESS(CG of DLC3 – BODY GROUND)

(a) Measure the resistance according to the value(s) in the


table below.
Standard:
Tester connection Condition Specified condition
CG – Body ground Always Below 1 Ω

CG H40173 NG REPAIR OR REPLACE WIRE HARNESS(CG of


DLC3 – BODY GROUND)

OK

2004 COROLLA (RM1037U)

Author: Date: 756


05–592
DIAGNOSTICS – SUPPLEMENTAL RESTRAINT SYSTEM (April, 2003)

3 CHECK WIRE HARNESS(TC of AIRBAG SENSOR ASSY CENTER – BODY


GROUND)

(a) Measure the resistance according to the value(s) in the


table below.
Standard:
Tester connection Condition Specified condition
TC – Body ground Always 1 MΩ or Higher

TC

H40065
NG REPAIR OR REPLACE WIRE HARNESS AND
EACH ECU

OK

REPLACE AIR BAG SENSOR ASSY CENTER

2004 COROLLA (RM1037U)

Author: Date: 757

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