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Control Unit Input Test
1. Before testing exterior light control functions, troubleshoot the multiplex control system (see page 22-137).
M u l t i p l e x C o n t r o l U n i t , Driver's:
2. Remove the driver's multiplex control unit f r o m the driver's under-dash fuse/relay box.
3. Inspect the connector and socket terminals to be sure they are all making g o o d contact.
• If the terminals are b e n t loose or corroded, repair t h e m as necessary, and recheck the system.
• If the terminals look OK, go to step 4.
Fuse/relay box socket
RED/WHT
RED/GRN
Wire side of female terminals
4. Make these input tests at the connector or fuse/relay box socket.
• If any test indicates a problem, find and correct the cause, then recheck the system.
* If all the input tests prove OK, go to step 5.
^
Cavity
Wire
Test condition
Test: Desired result
Possible cause if result is not obtained
A24
Fuse/relay
box socket
Ignition switch
ON (II)
Check for voltage to ground:
There should be battery
voltage.
• Blown No. 9 (7.5A) fuse in the driver's
under-dash fuse/relay box
• An open in the wire
• Faulty driver's under-dash fuse/relay box
A12
Fuse/relay
box socket
Under all
conditions
Check for voltage to ground:
There should be battery
voltage.
• Blown No. 13 (7.5A) fuse in the passenger's
under-dash fuse/relay box
• An open in the wire
A13
Fuse/relay
box socket
Ignition key is in
the ignition
switch
Check for voltage to ground:
There should be 1 V or less.
• Faulty ignition switch
• An open in the wire
• Poor ground (G401)
A16
Fuse/relay
box socket
Driver's door
open
Check for voltage to ground:
There should be less than 1 V.
• Faulty driver's door switch
• An open in the wire
A14
Fuse/relay
box socket
Under all
conditions
Check for continuity to ground:
There should be continuity.
• Poor ground (G401)
• An open in the wire
A10
Fuse/relay
box socket
Combination light
switch (ON) and
jump battery
voltage to A10
The headlights should come on.
• Poor ground (G401)
• An open in the wire
• Faulty headlight relay
• Faulty combination light switch
A22
Fuse/relay
box socket
Combination
light switch (ON)
Check for continuity to ground:
There should be continuity.
• Poor ground (G401)
• An open in the wire
• Faulty combination light switch
A6
Fuse/relay
box socket
Combination light
switch (ON) and
Jump battery
voltage to B16
(RED/GRN)
Check for voltage to ground:
There should be battery
voltage.
• Blown No. 10 (10 or 15A) fuse in the
passenger's under-dash fuse/relay box
• Faulty combination light switch
• Faulty taillight relay.
• An open in the wire.
B16
RED/GRN
Combination
light switch (ON)
Check for continuity to ground:
There should be 75 Q
resistance.
• Poor ground (G401)
• A n open in the wire
• Faulty combination light switch
• Faulty taillight relay
B13
RED/WHT
Passing switch
ON
Check for continuity to ground:
there should be continuity.
• Poor ground (G401)
• An open in the wire
• Faulty combination light switch
(cont'd)
22-93
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Troubleshooting
