CRUISE CONTROL SWITCH
See CRUISE CONTROL SYSTEMS article.
HORN SWITCH
- Disconnect negative battery cable. Remove covers from sides of steering wheel, then loosen Torx screws securing air bag module to steering wheel. Lift out air bag module and place it on top of steering column (leave connector attached). Disconnect harness connector from combination switch. (Scheme 12)
- Connect ohmmeter between chassis ground and terminal No. 6 of 6-pin connector (backprobe terminal). There should be no continuity. Press horn contact plate against steering wheel spoke. There should be continuity. If continuity is not as specified, replace steering wheel or harness as necessary.
Scheme 12
IGNITION SWITCH
Remove ignition switch. Check for continuity between specified terminals of ignition switch. See appropriate IGNITION SWITCH CONTINUITY table. (Scheme 13), (Scheme 14) or (Scheme 15). If continuity is not as specified, replace ignition switch.
| Switch Position | Terminals No. |
|---|---|
| LOCK | (1) |
| ACC | 2 & 3 |
| ON | 2, 3 & 4; 6 & 7 |
| START | 1, 2 & 4; 6, 7 & 8 |
| (1) Continuity should not exist between any terminals. | |
| (1) | Continuity should not exist between any terminals. |
IGNITION SWITCH CONTINUITY (ES300)
| Switch Position | Terminals No. |
|---|---|
| LOCK | (1) |
| ACC | 2 & 3 |
| ON | 2, 3 & 4; 6 & 7 |
| START | 1, 2 & 4; 6, 7 & 8 |
| (1) Continuity should not exist between any terminals. | |
| (1) | Continuity should not exist between any terminals. |
IGNITION SWITCH CONTINUITY (GS300, GS400 & LS400)
| Switch Position | Terminals No. |
|---|---|
| LOCK | (1) |
| ACC | 3 & 4 |
| ON | 2, 3 & 4; 6 & 11 |
| START | 1, 2 & 4; 5, 6 & 11 |
| (1) Continuity should not exist between any terminals. | |
| (1) | Continuity should not exist between any terminals. |
IGNITION SWITCH CONTINUITY (SC300 & SC400)
Scheme 13
Scheme 14
Scheme 15
KEY UNLOCK WARNING SWITCH
Remove ignition switch. Key unlock warning switch is mounted on ignition switch. Insert ignition key into ignition switch. Check continuity between key unlock warning switch terminals No. 1 and 2 (GS300, GS400 and LS400) or terminals No. 9 and 10 (SC300 and SC400). (Scheme 18) Continuity should exist. If continuity does not exist, replace key unlock warning switch.
LIGHT CONTROL SWITCH
Remove steering column covers. Disconnect electrical connectors from combination switch. Check for continuity between specified terminals of combination switch connector. (Scheme 16), (Scheme 17) or (Scheme 18). See appropriate LIGHT CONTROL SWITCH CONTINUITY table. If continuity does not exist, replace switch.
| Switch Position | Terminals No. | |
|---|---|---|
| Headlight/Taillight Switch | ||
| Off | (1) | |
| Tail | 14 & 16 | |
| Head | 13, 14 & 16 | |
| Auto | 12 & 16 | |
| Foglight Switch | ||
| Off | (1) | |
| On | 10 & 11 | |
| Dimmer Switch | ||
| Flash-To-Pass | 7, 8 & 16 | |
| Low Beam | 16 & 17 | |
| High Beam | 7 & 16 | |
| Turn Signal Switch | ||
| Left | 1 & 2 | |
| Neutral | (1) | |
| Right | 2 & 3 | |
| (1) Continuity should not exist between any terminals. | ||
| (1) | Continuity should not exist between any terminals. |
LIGHT CONTROL SWITCH CONTINUITY (ES300)
| Switch Position | Terminals No. | |
|---|---|---|
| Headlight/Taillight Switch | ||
| Off | (1) | |
| Tail | 15 & 16 | |
| Head | 14, 15 & 16 | |
| Auto | 13 & 16 | |
| Foglight Switch | ||
| Off | (1) | |
| On | 11 & 12 | |
| Dimmer Switch | ||
| Flash-To-Pass | 8, 9 & 17 | |
| Low Beam | 17 & 18 | |
| High Beam | 8 & 17 | |
| Turn Signal Switch | ||
| Left | 1 & 2 | |
| Neutral | (1) | |
| Right | 2 & 3 | |
| (1) Continuity should not exist between any terminals. | ||
| (1) | Continuity should not exist between any terminals. |
LIGHT CONTROL SWITCH CONTINUITY (GS300, GS400 & LS400)
| Switch Position | Terminals No. | |
|---|---|---|
| Headlight/Taillight Switch | ||
| Off | (1) | |
| Tail | B3 & B4 | |
| Head | B3, B4 & B13 | |
| Auto | B4 & B12 | |
| Dimmer Switch | ||
| Flash-To-Pass | B7, B9 & B18 | |
| Low Beam | B1 & B18 | |
| High Beam | B9 & B18 | |
| Turn Signal Switch | ||
| Left | A14 & B10 | |
| Neutral | (1) | |
| Right | A7 & B10 | |
| Fog Light Switch | ||
| On | A10 & A11 | |
| Off | (1) | |
| (1) Continuity should not exist between any terminals. | ||
| (1) | Continuity should not exist between any terminals. |
LIGHT CONTROL SWITCH CONTINUITY (SC300 & SC400)
Scheme 16
Scheme 17
Scheme 18
TURN SIGNAL FLASHER
For testing procedure, see RELAYS .
WIPER/WASHER SWITCH
For testing procedure, see WIPER/WASHER SYSTEMS article.
Preliminary Information
Remove relay. See appropriate RELAY LOCATIONS table. Identify relay type and perform appropriate relay test. See RELAY IDENTIFICATION table. Replace relay if it does not test as specified.
| Component | Location |
|---|---|
| Foglight Relay | Above Left Kick Panel |
| Headlight Relay | In Fuse/Relay Block, Near Left Front Strut Tower |
| Horn Relay | In Fuse/Relay Block, Near Left Front Strut Tower |
| Taillight Control Relay | In Fuse/Relay Block, Under Left Side Of Dash |
| Turn Signal Flasher Relay | Behind Left Kick Panel |
RELAY LOCATIONS (ES300)
| Component | Location |
|---|---|
| Foglight Relay | Behind Left Kick Panel |
| Headlight Control Relay | In Fuse/Relay Block, Forward Of Left Front Strut Tower |
| Horn Relay | On Left Rear Corner Of Engine Compartment |
| Taillight Control Relay | In Fuse/Relay Block, Behind Left Side Of Dash |
RELAY LOCATIONS (GS300 & GS400)
| Component | Location |
|---|---|
| Foglight Relay | In Fuse/Relay Block, Behind Left Side Of Dash |
| Headlight Control Relay | In Fuse/Relay Block, On Left Front Strut Tower |
| Headlight Dimmer Relay | In Fuse/Relay Block, On Left Front Strut Tower |
| Horn Relay | In Fuse/Relay Block, On Left Front Strut Tower |
| Taillight Control Relay | In Fuse/Relay Block, Behind Left Side Of Dash |
| Turn Signal Flasher Relay | In Fuse/Relay Block, Behind Left Side Of Dash |
RELAY LOCATIONS (LS400)
| Component | Location |
|---|---|
| Headlight & Dimmer Relays | In Fuse/Relay Block, On Left Front Strut Tower |
| Horn Relay | Behind Left Kick Panel |
| Taillight Control Relay | Behind Left Kick Panel |
| Turn Signal Flasher Relay | Behind Left Kick Panel |
RELAY LOCATIONS (SC300 & SC400)
| Application | (1) Relay Type | |
|---|---|---|
| Foglight Relay | ||
| ES300 | G | |
| Except ES300 | E | |
| Headlight Control Relay | B | |
| Headlight Dimmer Relay | ||
| ES300, GS300, GS400 & LS400 | A | |
| SC300 & SC400 | C | |
| Horn Relay | ||
| Except GS300 & GS400 | D | |
| GS300 & GS400 | G | |
| Taillight Control Relay | ||
| ES300, GS300 & GS400 | G | |
| LS400 | B | |
| SC300 & SC400 | E | |
| Turn Signal Flasher Relay | F | |
| (1) see scheme 8- see scheme 14. | ||
| (1) | See scheme 8- see scheme 14. |
RELAY IDENTIFICATION
COMBINATION SWITCH
Note. Spiral cable is an integral part of combination switch.