Honda Prelude 1993 Service Manual page 1381

Supplemental Restraint System (SRSI
Troubleshooting {cont'd
SRS Indicator Light Stays on Conrinuously
1. Make a photoeopy of this page (without front
passenger's airbag), or the next page (with tront
p a s s e n g e r ' s a i r b a g ) .
2. Connect Test Harness A (O7MAZ-SLOOSOOI to
the SRS unit as shown.
3, Turn the ignition switch ON.
a Voltages in the chart assume the car,s,,battery
voltage" is about 12 volts. Less than 12 volts
will result in different or possibly false readings.
a Do not disconnect the airbag from the circuit
when checking SRS unit voltages.
4.
First, check for voltage between Test Harness Ter-
m i n a l N o . 1 2 a n d g r o u n d .
a lf voltage is indicated, there is a poor ground
( s e e p a g e 2 3 - 3 1 7 ) .
a lf no voltage is indicated, continue with check-
ing all the other terminals.
5.
Record your voltage readings. tor each terminal, in
the row of blank boxes near the top of the chart.
Without Front Passonger's Airbag:
NOTE: Do not disconnect the airbag when checking SRS unit voltages.
6.
Compare each reading wilh the voltage ranges
listed in the column below it. lf the reading is within
a range, circle that range.
a lf you circled all the Failure Mode ranges across
any row, check the car for the probable Failure
Mode listed at the end of the row. (Refer to the
letter for that Mode on the following pages).
a lf you did not circle all the ranges across any
row, replace the SRS unit with a known-good
unit, and retest.
- lf all your voltage readings are now Normal,
replace the SRS unit.
- lf your voltage readings are still not normal
but they don't tit within a complete row ot
Failure Mode ranges, check the condition oi
the terminals in each of the SRS connectors
shown in the system diagram on page
1
S A D H
vcc
5
S V
8
SADC
1 0
BUC]
1 2
GND
t 3
rDc
P.obable Failure Mode
4 3
- 5 6
4 . 5
- 5 . 5
1 2 . O
1 4 . 3
5 . 6
- 7 . 3
1 1 . 5
- 1 4 _ 5
0
8 . 5
- 1 3 . 6
8 . 4
1 0 . 9
2 . 8
- 3 . 7
4 5
5 . 5
12.O
1 4 . 3
3 . 7
4 . 9
1 1 . 5
- 1 4 . 5
0
2 0
8 . 5
8 . 4
- 1 0 . 9
A Open in one cowl sensor.
0
4 . 5
r 2 . 0
1 4 . 3
0
1 1 . 5
t 4 5
0
2.O
- 8 . 5
8 . 4
1 0 . 9
. Open in both cowl
. shon to driv€f's atbag
8 6
4 . 5 12.O
- 1 4 . 3
1 1 . 2
1 4 . 6
1 1 . 5
1 4 . 5
0
2.0
8 . 5
8 . 4
- r 0.9
Short in cowl sensor of
C open in both dash sen
5 . 7
- 1 . 4
4 . 5
5 5
1 2 . O
I 4 . 3
1 1 . 5
1 4 . 5
0
2 0
8 . 5
8 . 4
1 0 . 9
D Open in one dash sensof.
8 . 6
4 . 5
5 . 5
12.0
1 4 . 3
0
1 1 . 5
I 4 . 5
0
2 . O
8 5
4 . 4
- 1 0 9
c Open n driver's anbag
'
inllaror or .able recl
4 3
- 5 6
0
0
5 . 6
- 7 . 3
1 1 . 5
1 4 . 5
0
2 . 0
8 . 5
8 . 4
- t o . 9
H Blown SRS luse {No. 24
' '
1 0 A ) o r o p e n i n t h e w t e .
4 . 3
5 . 6
4 . 5
- 5 5
1 2 . 4
I 4 . 3
5 . 6
- 7 3 - 1 4 . 5
0
0
( 8 . 5
1 3 . 6
8 . 4
1 0 . 9
I
Shon (o' open) in SRS
In0rcalor wrre harness.
23-304