Dodge RAM TRUCK 1500 1995 Service Manual page 663

I R 8W-43 AIRBAG SYSTEM
8W - 43 - 1
AIRBAG SYSTEM
AIRBAG CONTROL MODULE (ACM)
Two circuits provide battery voltage to the Airbag
Control Module (ACM); F14 and F23. Circuits F14
and F23 are connected to separate bus bars in the
fuse block. Different circuits from the Power Distri­
bution Center (PDC) and the ignition switch supply-
battery voltage to the fuse block bus bars.
Circuit F23 supplies battery voltage to the ACM
only when the ignition switch is in the RUN position.
Circuit F14 powers the ACM when the ignition
switch is in either the START or RUN position.
In either the START or RUN position, the ignition
switch connects circuit A21 circuit with circuit Al
from fuse 3, a 40 amp, in the PDC. Circuit A21 cir­
cuit supplies battery voltage to the fuse block bus bar
that feeds circuit F14. Fuse 12, a 15 amp, in the fuse
block protects circuit F14. Circuit F14 connects to
cavity 6 of the ACM.
When the ignition switch is in the RUN position, it
connects circuit A2 from fuse 2, a 40 amp, in the
PDC to circuit A22. Circuit A22 supplies battery volt­
age to the fuse block bus bar that feeds circuit F23.
Fuse 16, a 15 amp, in the fuse block protects circuit
F23. Circuit F23 connects to cavity 5 of the ACM.
The ACM is case grounded and has an external
dedicated ground, circuit Z6.
AIRBAG IMPACT SENSORS
Two airbag impact sensors provide input to the Air-
bag Control Module (ACM). Each sensor has two cir­
cuits that connect to the ACM.
From the left impact sensor, Circuit R47 connects
to the ACM at cavity 1 of the 13 way connector. Cir­
cuit R49 connects to cavity 2 of the 13 way connector.
From the right impact sensor, Circuit R46 connects
to the ACM at cavity 13 of the 13 way connector. Cir­
cuit R48 connects to cavity 12 of the 13 way connec­
tor.
AIRBAG SQUIB (AIRBAG IGNITER)
Two circuits, R43 and R45, connect the ACM to the
driver's side airbag squib (igniter) after passing
through the clock spring connector. Circuit R43 con­
nects to cavity 2 of the ACM 4 way connector; circuit
R45 connects to cavity 3 of the ACM 4 way connector.
R43 and R45 are a twisted pair of wires.
AIRBAG WARNING LAMP
Circuit R41 connects the airbag warning lamp to
cavity 7 of the ACM 13 way connector. The airbag
warning lamp is part of the instrument cluster. Refer
to section 8W-40, Instrument Cluster.
AIRBAG DIAGNOSTIC CONNECTOR
The DRB scan tool connects to the airbag/ABS data
link connector. A twisted pair of wires, circuits Dl
and D2, send and transmit data between the ACM
and the DRB scan tool. Circuit Dl connects to cavity
4 of the ACM 13 way connector. Circuit D2 connects
to cavity 3 of the ACM 13 way connector.
DIAGRAM 1NDEI
Component ^ Page
Airbag .". . . . . .......8W-43-3
Airbag Control Module 8W-43-3
Airbag Impact Sensors 8W-43-3
Data Link Connector .8W-43-3
Fuse 2 (PDC) . .8W-43-2
Fuse 3 (PDC) .8W-43-2
Fuse 12 .8W-43-2
Fuse 16 . .8W-43-2
Ignition Switch .8W-43-2
Instrument Cluster 8W-43-3