Audio Head Unit
WARNING: This page is about a different car, the 2003 Lexus GS 430 and 2003 Lexus GS 300. However, it is still accessible from the selected car via links, so may be relevant.
AUDIO HEAD UNIT REFERENCE CHART
| Symbols (Terminal No.) | Condition | STD Voltage (V) | Problem symptom when open circuit is detected. |
|---|---|---|---|
| Problem symptom when short circuit is detected. | |||
| +B <--> GND (R3-1 <--> R3-20)*1, *2 B <--> GND (R2-4 <--> R2-2)*3 | Constant | 10-14 | Audio system does not operate. |
| ILL+ <--> GND (R3-2 <--> R2-2)*2 (R2-5 <--> R2-2)*3 | Light control switch TAIL | 10-14 | Audio head unit illumination does not light up. |
| Fuse is blown. | |||
| ANT <--> GND (R4-5 <--> R2-2)*3 | Radio switch ON | 10-14 | Antenna does not extend. |
| TX+ (R3-5)*1, *2 BUS+ (R3-10)*3 | AVC-LAN Communication circuit | - | Audio system does not operate. |
| MUTE <--> GND (R3-7 <--> R3-20)*1, *2 MUTE <--> GND (R3-8 <--> R2-2)*3 | Radio switch ON | 5 | Pop sound etc. |
| Audio system does not operate. | |||
| R+ <--> GND (R3-8 <--> R3-20)*1, *2 R+ <--> GND (R3-1 <--> R2-2)*1, *2 | Constant | 10-14 | Sound from right side speaker is small. |
| L+ <--> GND (R3-9 <--> R3-20)*1, *2 L+ <--> GND (R3-2 <--> R2-2)*3 | Constant | 10-14 | Sound from left side speaker is small. |
| ACC <--> GND (R3-11 <--> R3-20)*1, *2 ACC <--> GND (R2-1 <--> R2-2)*3 | Ignition switch ACC | 10-14 | Audio system does not operate. |
| ILL- <--> GND (R3-12 <--> R2-2)*2 (R2-6 <--> R2-2)*3 | Light control switch TAIL | Below 0.5 | Audio head unit illumination does not light up. |
| Fuse is blown. | |||
| ANTB <--> GND (R3-14 <--> R3-20)*2 ANTA <--> GND (R4-4 <--> R2-2)*3 | Radio switch ON | 10-14 | Antenna does not extend. |
| ANTA <--> GND (R3-4 <--> R3-20)*2 | Radio switch ON | 10-14 | Antenna does not extend. |
| TX-(R3-15)*1, *2 BUS-(R3-9)*3 | AVC-LAN Communication circuit | - | Audio system does not operate. |
| L- <--> GND (R3-6 <--> R2-2)*3 | Constant | 10-14 | Sound from left side speaker is small. |
| GND <--> Body ground (R3-20 <--> Body ground)*1, *2 GND (R2-2)*3 | Constant | Continuity | Audio system is normal. |
| TX2-(R2-9) | AVC-LAN Communication circuit | - | Audio system does not operate. |
| TX2+(R2-10) | AVC-LAN Communication circuit | - | Audio system does not operate. |