Chrysler 300M Service Manual page 314

LH
HORN
DIAGNOSIS AND TESTING - HORN
(1) Disconnect wire connector at each horn.
(2) Using a voltmeter, connect one lead to body
ground and the other lead to the horn relay output
pin of the horn connector (Fig. 1).
HORN CONNECTOR PIN CALL-OUT
PIN #
1 GROUND
2 HORN RELAY OUTPUT
Fig. 1 HORN CONNECTOR
The right horn is grounded on the front outboard
side of the right frame rail. The left horn is grounded
on the left front fender apron.
(3) When the horn switch is depressed, battery
voltage should be present. Repeat for the other horn.
(4) If no voltage, repair as necessary. If battery
voltage is present, go to next step.
(5) Using an ohmmeter, test the negative terminal
of the connector for continuity to ground. Repeat for
the other horn.
(6) If no ground, repair as necessary.
(7) If wires test OK and horn(s) does not sound,
replace horn(s).
REMOVAL
(1) Disconnect and isolate the battery negative
cable.
(2) Disconnect wire connector.
(3) Remove the horn bracket mounting bolt and
remove horn.
NOTE: Do not disconnect horn from horn bracket.
CIRCUIT NAME
INSTALLATION
(1) Position both horns and the mounting bracket
onto the vehicle as a unit.
(2) Install and tighten the screw that secures the
horn mounting bracket to vehicle. Tighten the screw
to 11.3 N·m (100 in. lbs.).
(3) Connect the wire connector.
(4) Connect the battery negative cable.
HORN RELAY
DIAGNOSIS AND TESTING - HORN RELAY
(1) Remove horn relay.
(2) Using ohmmeter, test between relay connector
terminals 85 to 86 for 75 ± 8 ohms resistance. If
resistance not OK, replace relay (Fig. 2).
Fig. 2 Horn Relay
30 - COMMON FEED
85 - COIL GROUND
86 - COIL BATTERY
87 - NORMALLY OPEN
87A - NORMALLY CLOSED
REMOVAL
(1) Disconnect and isolate the battery negative
cable.
(2) Open the driver's door and remove the left
instrument panel end cover.
(3) Remove the horn relay (Fig. 3).
INSTALLATION
(1) Insert the horn relay.
(2) Install the left instrument panel end cover.
(3) Reconnect the battery negative cable remote
terminal.
HORN 8H - 3