PARK LAMP RELAY
DESCRIPTION
The park lamp relay is located in the Power Dis-
tribution Center (PDC) of the vehicle. The park lamp
relay is a conventional International Standards
Organization (ISO) micro relay (Fig. 17). Relays con-
forming to the ISO specifications have common phys-
ical
dimensions,
current
capacities,
terminal
patterns, and terminal functions.
The park lamp relay cannot be adjusted or
repaired and, if faulty or damaged, the unit must be
replaced.
OPERATION
The park lamp relay is an electromechanical
switch that uses a low current input from the Front
Control Module (FCM) to control a high current out-
put to the park lamps. The movable common feed
contact point is held against the fixed normally
closed contact point by spring pressure. When the
relay coil is energized, an electromagnetic field is
produced by the coil windings. This electromagnetic
field draws the movable relay contact point away
from the fixed normally closed contact point, and
holds it against the fixed normally open contact
point. When the relay coil is de-energized, spring
pressure returns the movable contact point back
against the fixed normally closed contact point. A
resistor is connected in parallel with the relay coil in
the relay, and helps to dissipate voltage spikes and
electromagnetic interference that can be generated as
the electromagnetic field of the relay coil collapses.
The park lamp relay terminals are connected to
the vehicle electrical system through a connector in
the Junction Block (JB). The inputs and outputs of
the headlamp low beam relay include:
•
Common Feed Terminal - The common feed
terminal (30) is connected to the park lamps through
the park lamp relay output circuit and provides
ground to the park lamps when the relay is de-ener-
gized, and battery current to the park lamps when-
ever the relay is energized.
•
Coil Ground Terminal - The coil ground termi-
nal (85) is connected to a control output of the Front
Control Module (FCM) through a park lamp relay
control circuit. The FCM controls park lamp opera-
tion by controlling a ground path through this cir-
cuit.
•
Coil Battery Terminal - The coil battery ter-
minal (86) receives battery current at all times from
a fuse in the PDC through a fused B(+) circuit.
•
Normally Open Terminal - The normally open
terminal (87) receives battery current at all times
from a fuse in the Power Distribution Center (PDC)
through a fused B(+) circuit.
•
Normally Closed Terminal - The normally
closed terminal (87A) is connected to ground at all
times.
The park lamp relay can be diagnosed using con-
ventional diagnostic tools and methods.
DIAGNOSIS AND TESTING - PARK LAMP
RELAY
The park lamp relay (Fig. 18) is located in the
Power Distribution Center (PDC). Refer to the appro-
priate wiring information.
WARNING: ON VEHICLES EQUIPPED WITH AIR-
BAGS, DISABLE THE SUPPLEMENTAL RESTRAINT
SYSTEM BEFORE ATTEMPTING ANY STEERING
WHEEL, STEERING COLUMN, DRIVER AIRBAG,
PASSENGER AIRBAG, SEAT BELT TENSIONER,
FRONT IMPACT SENSORS, SIDE CURTAIN AIRBAG,
OR INSTRUMENT PANEL COMPONENT DIAGNOSIS
OR SERVICE. DISCONNECT AND ISOLATE THE
BATTERY
NEGATIVE
(GROUND)
CABLE,
THEN
WAIT TWO MINUTES FOR THE SYSTEM CAPACI-
TOR TO DISCHARGE BEFORE PERFORMING FUR-
THER DIAGNOSIS OR SERVICE. THIS IS THE ONLY
SURE WAY TO DISABLE THE SUPPLEMENTAL
RESTRAINT
SYSTEM.
FAILURE
TO
TAKE
THE
PROPER PRECAUTIONS COULD RESULT IN ACCI-
DENTAL AIRBAG DEPLOYMENT AND POSSIBLE
PERSONAL INJURY.
(1) Remove the park lamp relay from the PDC.
(2) A relay in the de-energized position should
have continuity between terminals 87A and 30, and
Fig. 17 ISO Micro Relay
30 - COMMON FEED
85 - COIL GROUND
86 - COIL BATTERY
87 - NORMALLY OPEN
87A - NORMALLY CLOSED
8L - 20
LAMPS/LIGHTING - EXTERIOR
DR
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 ...
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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 ...