Wiring Diagram AUDI A4 1998 - Special vehicles for emergency services
| E15 | Heated rear window switch |
| E72 | Two-way radio switch |
| J501 | Filter |
| T10ak | 10-pin connector, violet, right connector point, A pillar |
| T10al | 10-pin connector, dark brown, right connector point, A pillar |
| T10am | 10-pin connector, dark brown, on lower part of left A-pillar |
| 43 | Earth point, lower part of right A-pillar |
| 135 | Earth connection -2-, in dash panel wiring harness |
| A19 | Connection (58d), in dash panel wiring harness |
| A23 | Connection (30al), in dash panel wiring harness |
| * | Only models with tachograph 1310 |
| ** | Only models with tachograph 1318 |
Wiring Diagram AUDI A4 1998 - Special vehicles for emergency services
| A1 | Second battery |
| B | Starter |
| D | Ignition/starter switch |
| J7 | Battery cut-out relay |
| J207 | Starter inhibitor relay |
| S171 | Battery isolation relay fuse |
| S184 | Socket 1 fuse |
| S202 | Fuse B (brown) |
| S203 | Fuse C (red) |
| S204 | Fuse A, (yellow) |
| T1g | 1-pin connector, blue, left connector point, A pillar |
| T6z | 6-pin connector, red, connector point, electronics box, plenum chamber |
| T10ak | 10-pin connector, violet, right connector point, A pillar |
| U8 | External socket (220V) |
| 32 | Earth point, behind dash panel, left |
| A17 | Connection (61), in dash panel wiring harness |
| * | Only models with Audi saloons |
| ** | Only models with Audi Avant |
Wiring Diagram AUDI A4 1998 - Special vehicles for emergency services
| D | Ignition/starter switch |
| E300 | Weapons storage box switch |
| H | Horn plate |
| H2 | High tone horn |
| H7 | Low tone horn |
| J4 | Dual tone horn relay |
| S201 | Fuse E (blue) |
| T2ao | 2-pin connector, yellow, in roof trim |
| T5g | 5-pin connector, behind steering column switch trim |
| T6a | 6-pin connector, red, right connector point, A pillar |
| T10ak | 10-pin connector, violet, right connector point, A pillar |
| T10al | 10-pin connector, dark brown, right connector point, A pillar |
| V170 | Motor for weapons storage box |
| 135 | Earth connection -2-, in dash panel wiring harness |
| 176 | Earth connection, in right headlight wiring harness |
| A32 | Positive (+) connection (30), in dash panel wiring harness |
| A34 | Connection (75x), in dash panel wiring harness |
| A72 | Connection (71), in dash panel wiring harness |
| A90 | Connection (dual tone horn), in dash panel wiring harness |
| X60 | Connection (75x), in police wiring harness |
Wiring Diagram AUDI A4 1998 - Special vehicles for emergency services
| J503 | Sender/receiver unit |
| J504 | Sender/receiver unit operating unit |
| R21 | Bass loudspeaker, front left |
| R23 | Bass loudspeaker, front right |
| R26 | Middle-high tone loudspeaker, front left |
| R27 | Middle-high tone loudspeaker, front right |
| T6n | 6-pin connector, green, at A pillar, left |
| T6u | 6-pin connector, green, at A pillar, right |
| T8b | 8-pin connector, brown, on radio |
| 43 | Earth point, lower part of right A-pillar |
Wiring Diagram AUDI A4 1998 - Special vehicles for emergency services
| J500 | Blue light warning system control unit |
| J502 | Blue light warning system operating unit |
| T2aq | 2-pin connector, on blue light warning system control unit |
| T6ao | 6-pin connector, on blue light warning system operating unit |
| T13a | 13-pin connector, on blue light warning system control unit |
| T18 | 18-pin connector, on blue light warning system operating unit |
| X58 | Positive connection -1- (30), in police wiring harness |
| * | Only models with special signal system RTK-4 |
Wiring Diagram AUDI A4 1998 - Special vehicles for emergency services
| J500 | Blue light warning system control unit |
| J502 | Blue light warning system operating unit |
| T3al | 3-pin connector, on blue light warning system control unit |
| T6ao | 6-pin connector, on blue light warning system operating unit |
| T13a | 13-pin connector, on blue light warning system control unit |
| T18 | 18-pin connector, on blue light warning system operating unit |
| 43 | Earth point, lower part of right A-pillar |
| * | Only models with special signal system TOP-4/2 |
Wiring Diagram AUDI A4 1998 - Special vehicles for emergency services
| G24 | Tachograph |
| J218 | Combi-processor in dash panel insert |
| J441 | Tachograph isolation relay |
| T10ak | 10-pin connector, violet, right connector point, A pillar |
| T10al | 10-pin connector, dark brown, right connector point, A pillar |
| T10am | 10-pin connector, dark brown, on lower part of left A-pillar |
| T32 | 32-pin connector, blue, on dash panel insert |
| 43 | Earth point, lower part of right A-pillar |
| A27 | Connection (speed signal), in dash panel wiring harness |
| * | Only models with tachograph 1310 |
| ** | Only models with tachograph 1318 |
| *** | Only models with tachograph 1310, Audi saloons |
| **** | Only models with tachograph 1310, Audi Avant |
Wiring Diagram AUDI A4 1998 - Special vehicles for emergency services
| G24 | Tachograph |
| G91 | Impulse sender |
| J441 | Tachograph isolation relay |
| R30 | Impulse amplifier |
| T10am | 10-pin connector, dark brown, on lower part of left A-pillar |
| 43 | Earth point, lower part of right A-pillar |
| * | Only models with tachograph 1318 |
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