2003 HONDA CIVIC Circuit

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DTC 21-3: Short to Another Wire or
Decreased Resistance in Driver's Seat Belt
Euckle Tensioner
Special Tools Required. SRS inflator simulator 07SAZ-T840't1A. SRS simulator lead F 07XAZ-S230100
1. Erase the DTC memory (see page 23-26).
2. Turn the ignition switch ON (ll), and check that the
SRS indicator comes on for about 6 seconds and
then goes off.
Does the SRS indicator stay on?
YES Go to step 3.
NO Intermittent failure. system is OK at this time.
Go to Troubleshooting Intermittent Failures lseepage 23-26).
Turn the ignition switch OFF. Disconnect the
battery negative cable, and wait for 3 minutes.
Disconnect the driver's seat belt buckle tensioner
4P connector (A) from the floor wire harness.
Connectthe SRS inflator simulator (2 i)
connectors) and simulator lead F to the floor
wtre narness.
Reconnect the battery negative cable.
Erase the DTC memory.
6.
7.
8. Read the DTC.
ls DTC 21-3 ind icated?
YES-Go to step 9.
NO- Short in the driver's seat belt buckle
tensioner; replace the driver's seat belt buckle.l
9. Turn the ignition switch OFF. Disconnectthe
battery negative cable, and wait for 3 minutes,
10. Disconnect both side airbag 2P connectors (see
step 4 on page 23-21) and the front passenger's
seat belt buckle tensioner 4P
connector (see slep 6 on page 23-22).
11. DisconnectSRS unitconnectorB (18P)fromthe
SRS unit {see step 7 on page 23-22l.
'12. Disconnect the specialtool f rom the floor wire
harness.
13. Check resistance between the No. 1 and No. 10
terminals of SRS unit connector B (18P). There
should be an open circuit, or at least 1 M Q.
SRS UNIT CONNECTOR B {18PI
Wire side of female terminals
ls the resistance as specified?
YES Faulty SRS unit; replace the SRS unit (see
page 23-1221.a
NO Short in the floor wire harness; replace the
floor wire harness.l
GRN/YEL
GRN/BLK
23-55

sRs
9.
10.
DTC Troubleshooting (cont'dl
11.
Read the DTC.
ls DTC 21-5 indicated?
YES Go to step 9.
NO Short to ground in the driver's seat belt
buckle tensioner; replace the driver's seat belt
buckle.l
Turn the ignition switch OFF. Disconnect the
battery negative cable, and wait for 3 minutes.
Disconnect both side airbag 2P connectors (see
step 4 on page 23-21)and the front passenger's
seat belt buckle tensioner 4P connector (see step 6
on page 23-221.
Disconnect SRS unit connector B (18P) from the
SRS unit (see step 7 on page 23-22)
Disconnect the special tool from the floor wire
harness.
Check resistance between the No. '1 terminal of
SRS unit connector B (18P) and body ground, and
the No. 10 terminal and body ground. There should
be an open circuit, or at least 1 M Q.
12.
13.
SRS UNIT CONNECTOR B {18PI
ls the tesistance as specilied?
YES Faulty SRS uniu replace the SRS unit (see
page 23-122) .a
NO-Short to ground in the floor wire harness;
replace the floor wire harness.l
23-58
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DTC 4-1: Open in Front Passenger's Seat Belt
renstoner
DTC 4-2: lncreased Resistance in Front
Passenger's Seat Belt Tensioner
Special Tools Required. SRS inflator simulator 07SM-T84011A. SRS simulator lead C 07TAZ-S25011A. SRS simulator lead F 07XAZ-S230100
Erase the DTC memory (see page 23-26).
Turn the ignition switch ON {ll), and check that the
SRS indicator comes on for about 6 seconds and
then goes off.
Does the SBS indicator stay on?
YES-Go to step 3.
NO- Intermittent failure, system is OK at this time.
Go to Troubleshooting Intermittent Failures {seepage 23-26).
Turn the ignition switch OFF. Disconnect the
battery negative cable, and wait for 3 minutes.
Disconnect the front passenger's seat belt
tensioner 2P connector (A) from the floor wire
harness.
07TAZ-525011A
5. Connect the SRS inflator simulator (2 0 connector)
and simulator lead C to the floor wire harness.

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16. Disconnectthe driver's airbag connector (see step2 on page 23-211, front passenger's airbagconnector (see step 3 on page 23-21), and driver,sseat belt tensioner connector (see step 5 on page
23-221.
17. Disconnect SRS unit connector A (18p) from the
SRS unit (see step 7 on page 23-22).
18. Disconnect the special tool from dashboard wireharness B.
19. Check resistance between the No. 9 terminal andthe No. 18 terminal of SRS unit connector A (18p).
There should be an open circuit, or at least 1 Me.
SRS UNIT CONNECTOR A I18P}
Wire side of female terminals
ls the resistance as specified?
YES-Faulty SRS unit; replace the SRS unit (see
page 23-1221 .f
NO-Short in dashboard wire harness B; replace
dashboard wire harness B. I
RED/YEL
I]
t6r8 l \P
T
234568
10tl12t3151617
RED/BLK
DTC 4-4: Short to Power in Front Passenger's
Seat Belt Tensioner
Special Tools Required. SRS inflator simulator 07SAZ-T84011A. SRS simulator lead C 07TAZ-S25011A. SRS simulator lead F 07XAZ-S230100
1. Erase the DTC memory (see page 23-26).
2. Turn the ignition switch ON {ll), and check that the
SRS indicator comes on for about 6 seconds and
then goes off.
Does the SRS indicator stay on?
YES Go to step 3.
NO- Intermiftent failure. system is OK at this time.Go to Troubleshooting Intermittent Failures (see
page 23-261.
3. Turn the ignition switch OFF. Disconnect the
battery negative cable, and wait for 3 minutes.
4. Disconnectthe front passenger's seat belttensioner 2P connector (A) from the floor wire
harness.
07TAZ-S2501'lA
5. Connect the SRS inflator simulator (2 e connector)and simulator lead C to the floor wire harness.
{cont'd)
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sRs
DTC Troubleshooting (cont'dl
16. Disconnect the driver's airbag connector (see step
2 on page 23-21), front passenger's airbag
connector (see step 3 on page 23-21). and driver's
seat belt tensioner connector (see step 5 on page
23-22).
17. Disconnect SRS unit connector A (18P)from the
SRS unit (see step 7 on page 23-221.
18. Disconnect the specialtool from dashboard wire
harness B.
19. Check resistance between the No.9 terminal of
SRS unit connector A (18P) and body ground, and
the No. l8 terminal and body ground. There should
be an open circuit. or at least 1 M Q.
SRS UNIT CONNECTOR A {18P)
wire side of lemale terminals
ls the rcsistance as specified?
YES Faulty SRS uniU replace the SRS unit (see
page 23-1221.1
NO-Short to ground in dashboard wire harness B;
replace dashboard wire harness B.I
23-64
DTC 22-1: Open or Increased Resistance in
Front Passenger's Seat Belt Buckle Tensioner
Special Tools Required. SRS inflator simulator 07SAZ-T84011A. SRS simulator lead F 07XAZ-S230100
1 . Erase the DTC memory (see page 23-261.
2. Turn the ignition switch ON (ll), and check that the
SRS indicator comes on for about 6 seconds and
then goes otf.
Does the SRS indicator stay on?
YES-Go to step 3.
NO-lntermittent failure, system is OK at this time.
Go to Troubleshooting Intermittent Failures (see
page 23-26).
3. Turn the ignition switch oFF. Disconnect the
battery negative cable, and wait for 3 minutes.
4. Disconnectthe front passenger's seat belt buckle
tensioner 4P connector (A) from the floor wire
harness.
5. Connect the SRS inflator simulator (2 Q
connectors) and the simulator lead F to the floor
wtre harness.
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sRs
DTC Troubleshooting (cont'dl
8. Read the DTC.
ls DTC 22-3 indicated?
YES Go to slep 9.
NO-Short in the front passenger's seat belt buckle
tensioner; replace the front passenger's seat belt
buckle.l
9. Turn the ignition switch OFF. Disconnect the
battery negative cable, and wait for 3 minutes.
10. Disconnect both side airbag 2P connectors (see
step 4 on page 23-21)and the driver's seat belt
buckle tensioner 4P connector (see step 6 on page
23-22).
'11. Disconnect SRS unit connector B {18P)from the
SRS unit (see step 7 on page 23-221.
12. Disconnect the special tool from the floor wire
h a rness.
13. Check resistance between the No.2 and No. 11
terminals of SRS unit connector B ( 18P). There
should be an open circuit, or at least 'l M !) .
SRS UNIT CONNECTOR B {18P}
GRN/RED
Wire side oI female terminals
ls the resistance as specified?
YES Faulty SRS unit; replace the SRS unit (see
page 23'1221 .a
NO Short in the floor wire harness; replace the
floor wire harness.I
GRN
23-66
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DTC 22-4: Short to Power in Front Passenger's
Seat Belt Buckle Tensioner
SpecialTools Required. SRS inflator simulator 07SAZ-TB4011A. SRS simulator lead F 07XAz 5230100
1. Erase the DTC memory (see p age 23-26).
2. Turn the ignition switch ON {ll}, and check that the
SRS indicator comes on for about 6 seconds and
then goes off.
Does the SHS indicator stay on?
YES Go to step 3.
NO Inlermittentfailure,system isOKatthistime.
Go to Troubleshooting Intermittent Failures (see
page 23-261.
3. Turn the ignition switch OFF. Disconnect the
battery negative cable, and wait for 3 minutes.
4. Disconnect the front passenger's seat belt buckle
tensioner 4P connector (A) from the floor wire
narness.
5. Connect the SRS inflator simulator (2 !J
connectors) and simulator lead F to the floor wire
ha rness.
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sRs
DTC Troubleshooting (cont'dl
DTC 22-5: Short to Ground in Front
Passenger's Seat Belt Buckle Tensioner
Special Tools Required. SRS inflator simulator 07SAZ-T84011A. SRS simulator lead F 07XAZ-S230100
1 . Erase the DTC memory (see page 23-26).
2. Turn the ignition switch ON (ll), and check that the
SRS indicator comes on for about 6 seconds and
then goes off.
Does the SRS indicator stay on?
YES-Go to step 3.
NO - Intermittent failure, system is OK at this time.
Go to Troubleshooting Intermittent Failures (see
page 23-26).
3. Turn the ignition switch OFF. Disconnectthe
battery negative cable, and wait for 3 minutes.
4. Disconnectthe front passenger's seat belt buckle
tensioner 4P connector (A) from the floor wire
harness,
Connect the SRS inflator simulator (2 Q
connectors) and simulator lead F to the floor wire
narness.
Reconnect the battery negative cable.
Erase the DTC memory.
5.
6.
1.
23-68
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8. Read the DTC.
ls DTC 22-5 indicated?
YES-Go to step 9.
NO Short to ground in the front passenger's seat
belt buckle tensioner; replace the front passenger's
seat belt buckle.l
9. Turn the ignition switch OFF. Disconnectthe
battery negative cable, and wait for 3 minutes.
10. Disconnect both side airbag 2P connectors (see
step 4 on page 23-21) and the driver's seat belt
buckle tensioner 4P connector (see step 6 on page
23-22t.
11. Disconnect SRS unit connector B (18Plfrom the
SRS unit (see step 7 on page 23-221.
12. Disconnect the special tool from the floor wire
harness,
13. Check resistance between the No. 2 terminal of
SRS unit connector B (18P) and body ground, and
the No, 11 terminal and body ground. There should
be an open circuit, or at least 1 M Q.
SRS UNIT CONNECTOR g {18PI
ls the resistance as specified?
YES-Faulty SRS unit; replace the SRS unit (see
page 23-1221 .a
NO Short to ground in the floor wire harness;
replace the floor wire harness.l
bU
Wire side of female terminals

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DTC 9-3: Fau lty Driver's Seat Belt Buckle
Switch
1. Erase the DTC memory (see page 23 26).
2. Turn the ignition switch ON (ll), then buckle and
unbuckle the driver's seat belt several times.
3. Read the DTC.
ls DTC 9-3 indicated?
YES Go to step 4.
NO Intermittent failure, system is OK at this time.
Go to Troubleshooting Intermittent Failures (see
page 23-261.
Turn the ignition switch OFF.
Disconnect the driver's seat belt buckle switch 3P
connector (A) from the floor wire harness.
4.
5.
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6. Buckle the driver's seat belt.
Check resistance between the No. 1 and No.3
terminals ofthe driver's seat belt buckle switch 3P
conneclor. There should be 0 1 (J.
Check resistance between the No. 1 and No.2
terminals of the same connector. There should be
an open circuit, or at least 1 M Q .
DRIVER'S SEAT BELT BUCKLE SWITCH3P CONNECTOR
BLU/RED
Terminal side of male terminals
Terminal side of male terminals
Ate the resistance readings as specif ied?
YES - Go to step 7.
NO Replace the driver's seat belt buckle assembly,
then clear the DTC.I
(cont'd)
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sRs
DTC Troubleshooting (cont'dl
7, Unbuckle the driver's seat belt.
Check resistance between the No. 1 and No.2
terminals ofthe driver's seat belt buckle switch 3P
connector. There should be 0 1 Q.
Check resistance between the No. 1 and No. 3
terminals of the same connector. There should be
an open circuit, or at least 1 M Q
DRIVER'S SEAT BELTBUCKLE SWITCH 3P CONNECTOR
Terminal side of male terminals
BLU/RED
Terminal side oI male terminals
ls the rcsistance as specified?
YES Go to step 8.
NO-Replace the driver's seat belt buckle assembly,
then clear the DTC.I
23-72
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8. Check resistance between the No. 1 terminal ofthe
floor wire harness 3P connector and bodv oround.
There should be 0 '1 0.
FLOOR WIRE HARNESS 3P CONNECTOR
Wire side of female terminals
ls the resistance as specified?
YES Go to step 9.
NO Open in the floor wire harness or poor ground
connection at G551. lf G55'1 is OK, replace the floor
wrre harness.l
Disconnect the negative cable from the battery.
Disconnect SRS unit connector C (8P) from the SRS
unit {see step 7 on page 23-22).
9.
10.