Dodge RAM TRUCK 1500 1995 Service Manual page 471

i J - 2 TURN SIGNAL AND HAZARD WARNING SYSTEMS
B R
tween the two arms. When the hazard warning is ac­
tivated, current flows through the flasher. As the
current flows through the bimetal strip it heats and
pulls the flexible arms together until the contact
points close, allowing current flow to the lamps. As
the bimetal strip cools, the contact points are pushed
open and the cycle repeats.
MULTIFUNCTION SWITCH
The multi-function switch assembly (Fig. 2) is
mounted to the left side of the steering column. This
switch contains electrical circuitry for the following
functions:
• turn signals
• hazard warning
• headlamp beam selection
• headlamp optical horn
• windshield wipers
® windshield washers.
The information contained in this group addresses
only the switch functions for the turn signal and haz­
ard warning circuits. For information relative to
other switch functions, refer to the appropriate
group. However, the multi-function switch can not be
repaired. If any function of the switch is faulty, the
entire switch assembly must be replaced.
TURN SIGNAL INDICATOR LAMPS
These lamps are located in the instrument cluster.
They flash with the exterior turn signal lamps to
HAZARD WARNING
J938J-3
Fig. 2 Multi-Function Switch
give the driver a visual indication that a turn signal
or the hazard warning circuit is operating. For diag­
nosis and service of this component, refer to Group
8E - Instrument Panel and Gauges.
TURN SIGNAL LAMPS
The exterior lamps included in the turn signal and
hazard warning circuits include: the front park/turn
signal, and the rear tail/stop/turn signal. For diagno­
sis and service of these lamps, refer to Group 8L -
Lamps.
D I A G N O S I S
When diagnosing the turn signal or hazard warn­
ing circuits, remember that high generator output
can burn out bulbs rapidly and repeatedly. If this is a
problem on the vehicle being diagnosed, refer to
Group 8A - Battery/Starting/Charging Systems Diag­
nostics to test charging system.
WARNING; ON V E H I C L E S E Q U I P P E D WITH AN AIR-
B A G , R E F E R TO G R O U P 8M - RESTRAINT S Y S ­
T E M S B E F O R E ATTEMPTING S T E E R I N G W H E E L
COMPONENT DIAGNOSIS OR S E R V I C E . FAILURE
TO TAKE P R O P E R PRECAUTIONS COULD R E S U L T
IN ACCIDENTAL A I R B A G DEPLOYMENT AND P O S ­
S I B L E P E R S O N A L INJURY.
TURN SIGNAL
(1) Turn ignition switch to ON position. Move turn
signal lever down for left turn signal problem, or up
for right turn signal problem. Observe the turn indi­
cator lamp in the instrument cluster. If the lamp
comes on but does not flash, check for a turn signal
bulb that is not lit. Replace that bulb or repair cir­
cuits to that lamp, as required. Test operation. If
turn indicator does not light or still doesn't flash,
continue to next step.
(2) Remove and inspect fuse 6 in fuseblock module.
Replace fuse, if required.
(3) With ignition switch in ON position, check for
battery voltage at fuse 6. If OK, go to next step. If
not OK, repair circuit to ignition switch as required.
(4) With ignition switch in ON position, place turn
signal lever in neutral position. There should be bat­
tery voltage at the fuse side of the turn signal flasher
(L5 circuit). If OK, go to next step. If not OK, repair
circuit between fuse and turn signal flasher.
(5) Replace turn flasher with known good unit of
the same rating. The lamps should flash. If OK, dis­
card faulty flasher. If not OK, re-install original
flasher and go to next step. ' - *
(6) Locate the multi-function switch connector. See
diagnosis for Multi-Function Switch, in this group.
Check for battery voltage at the multi-function
switch connector cavity 17. If OK, replace multi-func­
tion switch. If not OK, repair open circuit to flasher
(L6 circuit).