Page 4 of 30

80D-4V1 MR-376-X76-80D000$020.mif
80D
UCH
Vdiag No.: 0F
Side lights:
The side lights are switched on directly using the lighting stalk, via the passenger compartment fuse and relay box.
This function lights all the side lights (front and rear) as well as the number plate lighting.
Dipped beam headlights:
The dipped beam headlights are switched on directly using the lighting stalk, via the passenger compartment fuse
and relay box.
This function lights only the two bulbs providing the dipped headlights function.
Main beam headlights:
The main beam headlights are switched on directly using the lighting stalk, via the passenger compartment fuse and
relay box.
This function lights only the two bulbs providing the main beam headlights function.
Rear fog light:
The rear fog light is switched on directly using the lighting stalk, via the passenger compartment fuse and relay box.
This function lights only the rear fog lights.
Hazard warning lights:
The "hazard warning lights illumination request" signal from the hazard warning lights switch is sent to the UCH,
which controls the hazard warning lights.
This function lights only the hazard warning lights. The UCH also manages the illumination of the hazard warning
lights in the event of impact detection.
Indicators:
The "left-hand or right-hand indicators illumination request" signal initiated by the driver using the lighting stalk is
sent to the UCH, which controls the left-hand and right-hand indicators.
LIGHTING
Fault finding – Role of components
Page 5 of 30
80D-5V1 MR-376-X76-80D000$030.mif
80D
UCH
Vdiag No.: 0F
Indicator lights
• List of system components and associated component codes:
• Indicator lights diagram645Passenger compartment electrical control unit
260Passenger compartment fuse box and relay
125Hazard warning lights switch
172Rear right-hand light
173Rear left-hand light
255Front right-hand indicator light
256Front left-hand indicator light
267Right-hand repeater
268Left-hand repeater
209Lighting stalk
LIGHTING
Fault finding – Operating diagram
Page 6 of 30
80D-6V1 MR-376-X76-80D000$030.mif
LIGHTING
Fault finding – Operating diagram80D
UCH
Vdiag No.: 0F
Side lights
• List of system components and associated component codes:
• Side lights diagram645Passenger compartment electrical control unit
260Passenger compartment fuse box and relay
166Right-hand number plate light
167Left-hand number plate light
172Rear right-hand light
173Rear left-hand light
184Right-hand side light
185Left hand side lights
209Lighting stalk
247Instrument panel
Page 10 of 30
80D-10V1 MR-376-X76-80D000$030.mif
LIGHTING
Fault finding – Operating diagram80D
UCH
Vdiag No.: 0F
Rear fog light
• List of system components and associated component codes:
• Rear fog light diagram260Passenger compartment fuse box and relay
173Rear left-hand light
247Instrument panel
209Lighting stalk
Page 29 of 30

80D-29
AFTER REPAIRCarry out a check using the diagnostic tool.
V1 MR-376-X76-80D000$120.mif
LIGHTING
Fault finding – Fault Finding Chart80D
UCH
Vdiag No.: 0F
ALP 10 The reversing lights do not operate
Check for the presence and condition of fuse
F14 (15 A) in the passenger compartment fuse
and relay box, component code 260.
Is the result of the check correct? Replace the fuse if necessary (see MR
374, Mechanical, 81C, Fuses, Fuses:
List and location of components).
Check the bulbs and condition of the bulb
supports.
Are the checks correct?Replace the bulbs if necessary (see MR
374 Mechanical, 81A, Rear lighting,
Rear light bulb: Removal - Refitting).
Check the condition and connection of the
connectors of components 155 and 172.
Are the checks correct?If the connector or connectors are faulty
and there is a repair procedure (see
Technical Note 6015A, Electrical
wiring repair, Wiring: Precautions for
repair), repair the connector, otherwise
replace the wiring.
Check for earth on the following connections:
–MF between component 172 and earth.
Is it correct?If the connection or connections are faulty
and there is a repair procedure (see
Technical Note 6015A, Electrical
wiring repair, Wiring: Precautions for
repair), repair the wiring, otherwise
replace it.
NO
YES
NO
YES
NO
YES
NO
YES
A
UCH_V0F_ALP10