Each time the ABS indicator fails to light due to an
open or short in the cluster ABS indicator circuit, the
cluster sends a message notifying the CAB of the
condition, then the instrument cluster and the CAB
will each store a DTC. For proper diagnosis of the
antilock brake system, the CAB, the PCI data bus, or
the electronic message inputs to the instrument clus-
ter that control the ABS indicator, a DRBIII
t
scan
tool is required. Refer to the appropriate diagnostic
information.
AIRBAG INDICATOR
DESCRIPTION
An airbag indicator is standard equipment on all
instrument clusters (Fig. 9). However, the instrument
cluster can be programmed to disable this indicator
on vehicles that are not equipped with the airbag
system, which is not available in some markets. The
airbag indicator is located near the upper edge of the
instrument cluster, between the tachometer and the
speedometer. The airbag indicator consists of a sten-
cil-like cutout of the words “AIR BAG” in the opaque
layer of the instrument cluster overlay. The dark
outer layer of the overlay prevents the indicator from
being clearly visible when it is not illuminated. A red
Light Emitting Diode (LED) behind the cutout in the
opaque layer of the overlay causes the “AIR BAG”
text to appear in red through the translucent outer
layer of the overlay when the indicator is illuminated
from behind by the LED, which is soldered onto the
instrument cluster electronic circuit board. The air-
bag indicator is serviced as a unit with the instru-
ment cluster.
OPERATION
The airbag indicator gives an indication to the
vehicle operator when the airbag system is faulty or
inoperative. The airbag indicator is controlled by a
transistor on the instrument cluster circuit board
based upon cluster programming and electronic mes-
sages received by the cluster from the Airbag Control
Module (ACM) over the Programmable Communica-
tions Interface (PCI) data bus. The airbag indicator
Light Emitting Diode (LED) is completely controlled
by the instrument cluster logic circuit, and that logic
will only allow this indicator to operate when the
instrument cluster receives a battery current input
on the fused ignition switch output (run-start) cir-
cuit. Therefore, the LED will always be off when the
ignition switch is in any position except On or Start.
The LED only illuminates when it is provided a path
to ground by the instrument cluster transistor. The
instrument cluster will turn on the airbag indicator
for the following reasons:
•
Bulb Test - Each time the ignition switch is
turned to the On position the airbag indicator is illu-
minated for about six seconds. The entire six second
bulb test is a function of the ACM.
•
ACM Lamp-On Message - Each time the clus-
ter receives a lamp-on message from the ACM, the
airbag indicator will be illuminated. The indicator
remains illuminated for about twelve seconds or until
the cluster receives a lamp-off message from the
ACM, whichever is longer.
•
Communication Error - If the cluster receives
no airbag messages for three consecutive seconds, the
airbag
indicator
is
illuminated.
The
indicator
remains illuminated until the cluster receives a sin-
gle lamp-off message from the ACM.
•
Actuator Test - Each time the cluster is put
through the actuator test, the airbag indicator will be
turned on, then off again during the bulb check por-
tion of the test to confirm the functionality of the
LED and the cluster control circuitry. The actuator
test illumination of the airbag indicator is a function
of the instrument cluster.
The ACM continually monitors the airbag system
circuits and sensors to decide whether the system is
in good operating condition. The ACM then sends the
proper lamp-on or lamp-off messages to the instru-
ment cluster. If the ACM sends a lamp-on message
after the bulb test, it indicates that the ACM has
detected a system malfunction and/or that the air-
bags and seat belt tensioners may not deploy when
required, or may deploy when not required. The ACM
will store a Diagnostic Trouble Code (DTC) for any
malfunction it detects. Each time the airbag indicator
fails to illuminate due to an open or short in the
cluster airbag indicator circuit, the cluster sends a
message notifying the ACM of the condition, the
instrument cluster and the ACM will each store a
DTC, and the cluster will flash the seatbelt indicator
on and off as a backup to notify the vehicle operator.
For proper diagnosis of the airbag system, the ACM,
the PCI data bus, or the electronic message inputs to
the instrument cluster that control the airbag indica-
tor, a DRBIII
t
scan tool is required. Refer to the
appropriate diagnostic information.
Fig. 9 Airbag Indicator
8J - 18
INSTRUMENT CLUSTER
DR
ABS INDICATOR (Continued)
Summary of Contents for 1997 Ram 1500
Page 7: ...Fig 5 FASTENER IDENTIFICATION 6 INTRODUCTION DR FASTENER IDENTIFICATION Continued ...
Page 8: ...Fig 6 FASTENER STRENGTH DR INTRODUCTION 7 FASTENER IDENTIFICATION Continued ...
Page 10: ...Fig 7 METRIC CONVERSION CHART DR INTRODUCTION 9 METRIC SYSTEM Continued ...
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Page 319: ...Fig 3 Cooling System Circulation 5 9L Diesel Engine 7 4 COOLING DR COOLING Continued ...
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Page 1560: ...Fig 23 FRAME DIMENSIONS DR FRAMES BUMPERS 13 17 FRAME Continued ...
Page 1561: ...Fig 24 140 5 IN WHEELBASE HEAVY DUTY 2 WHEEL DRIVE 13 18 FRAMES BUMPERS DR FRAME Continued ...
Page 1562: ...Fig 25 140 5 IN WHEELBASE HEAVY DUTY 4 WHEEL DRIVE DR FRAMES BUMPERS 13 19 FRAME Continued ...
Page 1563: ...Fig 26 160 5 IN WHEELBASE HEAVY DUTY 2 WHEEL DRIVE 13 20 FRAMES BUMPERS DR FRAME Continued ...
Page 1564: ...Fig 27 160 5 IN WHEELBASE HEAVY DUTY 4 WHEEL DRIVE DR FRAMES BUMPERS 13 21 FRAME Continued ...
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Page 2288: ...Fig 16 VEHICLE LEAD DIAGNOSIS AND CORRECTION CHART DR TIRES WHEELS 22 9 TIRES Continued ...
Page 2295: ......
Page 2398: ...Fig 10 DASH PANEL DR BODY STRUCTURE 23 103 SEALER LOCATIONS Continued ...
Page 2399: ...Fig 11 LOWER DASH PANEL 23 104 BODY STRUCTURE DR SEALER LOCATIONS Continued ...
Page 2400: ...Fig 12 ROOF PANEL DR BODY STRUCTURE 23 105 SEALER LOCATIONS Continued ...
Page 2401: ...Fig 13 CAB BACK PANEL 23 106 BODY STRUCTURE DR SEALER LOCATIONS Continued ...
Page 2402: ...Fig 14 LOWER DASH PANEL DR BODY STRUCTURE 23 107 SEALER LOCATIONS Continued ...
Page 2403: ...Fig 15 FLOOR PAN 23 108 BODY STRUCTURE DR SEALER LOCATIONS Continued ...
Page 2404: ...Fig 16 FRONT FLOOR PAN DR BODY STRUCTURE 23 109 SEALER LOCATIONS Continued ...
Page 2405: ...Fig 17 FLOOR PAN 23 110 BODY STRUCTURE DR SEALER LOCATIONS Continued ...
Page 2406: ...Fig 18 PICKUP BOX DR BODY STRUCTURE 23 111 SEALER LOCATIONS Continued ...
Page 2412: ...Fig 28 REAR DOOR INNER PANEL DR BODY STRUCTURE 23 117 STRUCTURAL ADHESIVE LOCATIONS Continued ...
Page 2413: ...Fig 29 SILL RAIL STD CAB 23 118 BODY STRUCTURE DR STRUCTURAL ADHESIVE LOCATIONS Continued ...
Page 2414: ...Fig 30 SILL RAIL QUAD CAB DR BODY STRUCTURE 23 119 STRUCTURAL ADHESIVE LOCATIONS Continued ...
Page 2419: ...Fig 31 FENDER BRACE 23 124 BODY STRUCTURE DR WELD LOCATIONS Continued ...
Page 2420: ...Fig 32 STEERING COLUMN SUPPORT DR BODY STRUCTURE 23 125 WELD LOCATIONS Continued ...
Page 2422: ...Fig 35 DASH PANEL Fig 36 LOWER PLENUM PANEL DR BODY STRUCTURE 23 127 WELD LOCATIONS Continued ...
Page 2423: ...Fig 37 FRONT FENDER Fig 38 DASH PANEL 23 128 BODY STRUCTURE DR WELD LOCATIONS Continued ...
Page 2424: ...Fig 39 FRONT FENDER Fig 40 DASH PANEL DR BODY STRUCTURE 23 129 WELD LOCATIONS Continued ...
Page 2425: ...Fig 41 HEADLAMP MOUNTING PANEL 23 130 BODY STRUCTURE DR WELD LOCATIONS Continued ...
Page 2427: ...Fig 43 AIR BAG MODULE BRACKET STANDARD CAB 23 132 BODY STRUCTURE DR WELD LOCATIONS Continued ...
Page 2429: ...Fig 45 REAR FLOOR CROSSMEMBER STANDARD CAB 23 134 BODY STRUCTURE DR WELD LOCATIONS Continued ...
Page 2432: ...Fig 49 FLOOR SILL STANDARD CAB DR BODY STRUCTURE 23 137 WELD LOCATIONS Continued ...
Page 2433: ...Fig 50 AIR BAG MODULE BRACKET QUAD CAB 23 138 BODY STRUCTURE DR WELD LOCATIONS Continued ...
Page 2435: ...Fig 52 REAR FLOOR CROSSMEMBER QUAD CAB 23 140 BODY STRUCTURE DR WELD LOCATIONS Continued ...
Page 2440: ...Fig 58 A PILLAR REINFORCEMENT STANDARD CAB DR BODY STRUCTURE 23 145 WELD LOCATIONS Continued ...
Page 2449: ...Fig 75 FLOOR SILL STANDARD CAB 23 154 BODY STRUCTURE DR WELD LOCATIONS Continued ...
Page 2450: ...Fig 76 BACK REINFORCEMENT STANDARD CAB DR BODY STRUCTURE 23 155 WELD LOCATIONS Continued ...
Page 2454: ...Fig 82 OUTER BODY SIDE APERTURE QUAD CAB DR BODY STRUCTURE 23 159 WELD LOCATIONS Continued ...
Page 2455: ...Fig 83 OUTER BODY SIDE APERTURE QUAD CAB 23 160 BODY STRUCTURE DR WELD LOCATIONS Continued ...
Page 2456: ...Fig 84 REAR FLOOR CROSSMEMBER QUAD CAB DR BODY STRUCTURE 23 161 WELD LOCATIONS Continued ...
Page 2457: ...Fig 85 CAB BACK REINFORCEMENT QUAD CAB 23 162 BODY STRUCTURE DR WELD LOCATIONS Continued ...
Page 2459: ...Fig 87 A PILLAR REINFORCEMENT QUAD CAB 23 164 BODY STRUCTURE DR WELD LOCATIONS Continued ...
Page 2460: ...Fig 88 B PILLAR REINFORCEMENT QUAD CAB DR BODY STRUCTURE 23 165 WELD LOCATIONS Continued ...
Page 2461: ...Fig 89 FRONT ROOF HEADER QUAD CAB 23 166 BODY STRUCTURE DR WELD LOCATIONS Continued ...
Page 2462: ...Fig 90 INNER BODY SIDE APERTURE QUAD CAB DR BODY STRUCTURE 23 167 WELD LOCATIONS Continued ...
Page 2465: ...Fig 93 TAPPING PLATES SHORT CARGO BOX ONLY 23 170 BODY STRUCTURE DR WELD LOCATIONS Continued ...
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Page 2516: ...Fig 3 Blower Motor Electrical Diagnosis DR DISTRIBUTION 24 29 BLOWER MOTOR Continued ...
Page 2517: ...Fig 4 Blower Motor Noise Vibration Diagnosis 24 30 DISTRIBUTION DR BLOWER MOTOR Continued ...
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Page 2627: ...Dealer Technical Operations 800 Chrysler Drive CIMS 486 02 76 Auburn Hills MI 48326 2757 ...