Wiring Diagram AUDI A4 2001 - Alarm system control unit - high tone horn - low tone horn
| D | Ignition/starter switch |
| E3 | Hazard warning light switch |
| E4 | Headlight dipper/flasher switch |
| H | Horn plate |
| H2 | High tone horn |
| H7 | Low tone horn |
| J4 | Dual tone horn relay |
| J85 | Alarm system control unit |
| S239 | Fuse in fuse box |
| S240 | Fuse in fuse box |
| T5g | 5-pin connector, behind steering column switch trim |
| T6a | 6-pin connector, red, right connector point, A pillar |
| T10ad | 10-pin connector, red, left connector point, A pillar |
| 81 | Earth connection -1-, in dash panel wiring harness |
| 176 | Earth connection, in right headlight wiring harness |
| 179 | Earth connection, in left headlight wiring harness |
| A5 | Positive (+) connection (right turn signal), in dash panel wiring harness |
| A6 | Positive (+) connection (left turn signal), in dash panel wiring harness |
| A32 | Positive (+) connection (30), in dash panel wiring harness |
| A72 | Connection (71), in dash panel wiring harness |
| A90 | Connection (dual tone horn), in dash panel wiring harness |
| * | Connection is isolated on Taxi models |
Wiring Diagram AUDI A4 2001 - Alarm system control unit - two-way radio - alarm system off switch
| E217 | Alarm system off switch |
| J85 | Alarm system control unit |
| K1 | Main beam warning lamp |
| L1 | Twin filament bulb/sealed beam insert, left |
| L2 | Twin filament bulb/sealed beam insert, right |
| R | Radio |
| R8 | Two-way radio |
| S17 | Fuse in fuse box/relay plate |
| S18 | Fuse in fuse box/relay plate |
| S19 | Fuse in fuse box/relay plate |
| S57 | Alarm system fuse |
| S182 | Taximeter fuse |
| T6 | 6-pin connector, light pink, right connector point, A pillar |
| T10ae | 10-pin connector, light pink, left connector point, A pillar |
| T10af | 10-pin connector, red, radio connector IV |
| T32 | 32-pin connector, blue, on dash panel insert |
| 135 | Earth connection -2-, in dash panel wiring harness |
| A40 | Positive (+) connection -1- (30), in dash panel wiring harness |
| A51 | Connection (56), in dash panel wiring harness |
| A98 | Positive (+) connection -4- (30), in dash panel wiring harness |
Wiring Diagram AUDI A4 2001 - Taxi alarm system II control unit - two-way radio - two-way radio loudspeaker - taxi sign light bulb - alarm system switch
| E75 | Alarm system switch |
| E76 | Two-way radio button |
| E216 | Taxi alarm system II switch |
| J430 | Taxi alarm system II control unit |
| L36 | Taxi sign light bulb |
| R8 | Two-way radio |
| R25 | Two-way radio loudspeaker |
| S181 | Taxi alarm system II fuse |
| T2l | 2-pin connector, yellow, left connector point, A pillar |
| T2al | 2-pin connector, black, left connector point, A pillar |
| T2am | 2-pin connector, green, left connector point, A pillar |
| 135 | Earth connection -2-, in dash panel wiring harness |
| * | Applicable up to model year 2000 |
| ** | Applicable from model year 2001 |
| *** | Taxi roof sign - new version |
| **** | Taxi roof sign - old version |
Wiring Diagram AUDI A4 2001 - Taximeter - taxi sign switch - interior light switch (taxi) - dash panel insert
| D | Ignition/starter switch |
| E115 | Interior light switch (taxi) |
| E138 | Taxi sign switch |
| G41 | Taximeter |
| J218 | Combi-processor in dash panel insert |
| T5m | 5-pin connector, black, in centre console |
| T15o | 15-pin connector, grey, left connector point, A pillar |
| T32 | 32-pin connector, blue, on dash panel insert |
| W | Interior light, front |
| 135 | Earth connection -2-, in dash panel wiring harness |
| A19 | Connection (58d), in dash panel wiring harness |
| A21 | Connection (86s), in dash panel wiring harness |
| A27 | Connection (speed signal), in dash panel wiring harness |
| A29 | Connection (interior light), in dash panel wiring harness |
| A80 | Connection -1- (X), in dash panel wiring harness |
| * | Applicable up to model year 2000 |
| ** | Applicable from model year 2001 |
| *** | Connection for printer / card reader |
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