SRS CONTROL SYSTEM 9C-51
DTC: 55 Vehicle Type Error
Outline
Description of Circuit
DTC 55 is set when unmatched SRS control unit or SRS
harness installation is suspected.
Turn the starter switch to “ON”. SRS control unit reads
the condition of vehicle type identification terminals 3, 4,
13, 14 for judgment.
Condition when DTC is Set
It is correct when the terminal 4 only is connected to
ground. If the harness is proper, the DTC is set when un-
matched SRS control unit is installed. Also, if the SRS
control unit is proper, the DTC is set when unmatched
harness is installed.
Action to be Taken
SRS control unit turns the “SRS” warning lamp blinking
and set the DTC 55.
However, when both of SRS control unit and SRS har-
ness are faulty, the DTC may not be set.
Condition when DTC is Cleared
When turning the starter switch to OFF with correct
matching of SRS control unit and SRS harness.
Point of Diagnosis
It is correct when the terminal 4 only is connected to
ground. At first, make sure the SRS harness A3, A4,
A13, A14 have no terminal.
B
ACC
ON
ST
STARTER SWITCH
METER
AIRBAG
SRS CONTROL UNIT
DATA LINK CONNECTOR
16 15 14 13 12 11 10 9
8 7 6 5 4 3 2 1
0.5
B
0.5
GY
0.5
SB
0.5
GY
0.5
SB
16
4
19
15
18
7
8
20
6
5
0.85B
0.85B
0.5
B/R
0.5
B/R
0.5
W/R
0.5
B/R
0.5
B/R
0.5
W/R
0.5
B
1.25
B
2L
3
B/Y
2
14
3W/L
8B
3W/L
40A
KEY SW
10A
SRS
AIRBAG
SRS COIL
ASSEMBLY
1
2
2
1
0.5
Y
0.5
Y/B
3
10A
METER
0.5
B/Y
18
OFF
N9A0086E