Ignition Switch
The Datsun 1200 ignition switch is also known as an "Ignition Starter Switch". For STD models, it is integrated into the Key lock switch. For Super DX and higher grades, it bolts to the back of the key cylinder.
See also: Keys
Usage
1972 USA Owners manual (Page 11 ... ):
[[1972#29371|
]]
Instruments and Controls
Variations
5-position switch (with ACC) vs 4-position switch:
3-position JDM "Garage" switch vs OPTION 5-position switch:
Portugal market:
Interruptor de ignićāo [Ignition switch] Desligado [OFF] Ligado [ON] Arranque [START]
Standard Type
STD 1200s and DX built for Japan market have a dash-mounted switch instead of steering column-mounted (Steering Lock). The keylock & ignition switch are integrated with only three or four spade terminals on the switch.
The ignition switch is mounted via bracket on the dash.
https://i297.photobucket.com/albums/mm219/ddgonzal/Datsun%201200/wiki/S52-4_ignition-2.jpg https://i297.photobucket.com/albums/mm219/ddgonzal/Datsun%201200/wiki/S52-4_ignition-1.jpg
The key lock cylinder and ignition switch are integrated in one unit.
NOTE: Early units had a 3-connector ignition switch. Later units had four connectors.
Part Numbers
SWITCH-IGNITION for NON-STEERING LOCK 25150-H1000 SWITCH COMP.-ignition & starter (up to '71-3) 25150-H1010 SWITCH COMP.-ignition & starter (from '73-8) 25150-H2500 SWITCH COMP.-ignition PB110 DX #25150-G1001 SWITCH COMP.-ignition & starter (up to '78-3)
Wiring
4-terminal type BW IGN BR COIL (for start position) BY STARTER W POWER (12V in from Fusible Link)
3-terminal type POWER START ON
4-terminal Wiring
3-terminal
25150-H1000 SWITCH COMP.-ignition & starter (up to '71-3) 25150-H1010 SWITCH COMP.-ignition & starter (from '73-8) [alternate manufacturer]
Niles OEM for Datsun
25150-G1001
4-terminal keyed OFF - ON - START
25150-G1001 SWITCH COMPLETE-ignition & starter (up to 1978-3)
http://datsun1200.com/uploads/newbb/174_67b3a9a3d70de.jpg http://datsun1200.com/uploads/newbb/174_67b3a9ac3f1c1.jpg http://datsun1200.com/uploads/newbb/174_67b3a9b5a55b6.jpg
https://i297.photobucket.com/albums/mm219/ddgonzal/Datsun%201200/wiki/25150-G1001-1.jpg https://i297.photobucket.com/albums/mm219/ddgonzal/Datsun%201200/wiki/25150-G1001-2.jpg https://i297.photobucket.com/albums/mm219/ddgonzal/Datsun%201200/wiki/25150-G1001-3.jpg
B210
B210 Van and B210U (export B210) by NILES 188139-8000 イグニツションSWサニー VB210, B210U, KB210U
https://i297.photobucket.com/albums/mm219/ddgonzal/Datsun%201200/Parts2/h42926804wansu_-img600x450-11660-2.jpg https://i297.photobucket.com/albums/mm219/ddgonzal/Datsun%201200/Parts2/h42926804wansu_-img600x450-11660-1.jpg https://i297.photobucket.com/albums/mm219/ddgonzal/Datsun%201200/Parts2/h42926804wansu_-img600x450-11660247.jpg
Steering Lock Type
A locking steering column was a Datsun 1200 OPTION for early STD and DX models. It was standard equipment for USA 1200s, JDM GL and GX, and newer JDM 1200 pickups
The actual electrical Ignition Switch for this type is removable, and bolts to the back of the Steering Lock. In other words, the Ignition Switch is not strictly part of the Lock Cylinder, but connects to it. A rectangular wire connector from the dash harness attaches to the ignition switch.
https://i297.photobucket.com/albums/mm219/ddgonzal/Datsun%201200/Parts/48750-E7705-1.jpg https://i297.photobucket.com/albums/mm219/ddgonzal/Datsun%201200/Parts/48750-H1900.jpg
Fitment of ignition switch into ASSY-LOCK STEERING
Late (large) vs 1970/1971 (small)
There are two types of LARGE units: single bolt tab & two-bolt tab
There are two types of SMALL units: 4-terminal switch & 5-terminal switch. The latter was not used by Datsun 1200
Switch Part Numbers
ELECTRICAL IGNITION SWITCH ASSEMBLY #48750-H1900 for STEERING LOCK -7803 #48750-E7705 5 POINT 0471- USA 0 48750-H1900 #48750-E4700 for STEERING LOCK 7804- [Small type]
Interchange
Later 1200 switches interchange with Datsun B310 and several other Datsun models, but not B210.
Ignition Switch Comparison 
* B110 Small size ~28mm diameter * B110 Large size ~34mm diameter
TIP: On the back of the switch, each contact is marked ('S', 'IG', etc. molded into the plastic). Double-check before replacing to ensure they are the same.
The larger-diameter switch has two mounting lugs and is used with Keylocks that have an ACC position. 1972 and 1973 1200s use this, all the way up to 1982 B310.
The small-diameter switch has one bolting lug. And has only four spade terminals without ACC position. It was used on Japan 1200s (USA only for 1971).
https://i297.photobucket.com/albums/mm219/ddgonzal/Datsun%201200/Parts/48750-H1900.jpg
B210
B210 ignition switch does not interchange with B110 per the parts catalogs.
Top: early B110. Bottom: B210
It looks like it would plug into the Small B110 harness, but is wired differently. Beware!
- AIRTEX 1S6174
- ACDelco E1478A Rockauto
- Datsun
- 1974-1978 B210
- 1973-1976 610
- 1975-1977 710
- 1976-1978 F10
- Subaru
- 1985-1989 DL, GL
- 1985-1987 GL-10
- 1987 Standard
48750-H1900
48750-H1900ᴳ ELECTRICAL IGNITION SWITCH ASSEMBLY for STEERING LOCK -7803
* USA early to 1971.03 * JDM B110/B120 to 1978.03 Small diameter Four spade connectors One screw lug
Type H19: B110U (USA), B110N (Canada)
https://i297.photobucket.com/albums/mm219/ddgonzal/Datsun%201200/Parts/48750-H1900.jpg
48750-E7705
48750-E7705ᴳ late 1971, 1972-1973 USA
48750-E7705 5 POINT 0471- USA no interchange with #48750-H1900 Large diameter Five spade terminals Two screw lugs
https://i297.photobucket.com/albums/mm219/ddgonzal/Datsun%201200/Parts/48750-E7705-1.jpg https://i297.photobucket.com/albums/mm219/ddgonzal/Datsun%201200/Parts/48750-E7705.jpg
Aftermarket * Standard Motor Products (SMP) US-120ᴳ * ACDelco E1406ᴳ * Beck/Arnley 2011174/201-1174 Rockauto $20 (2025) OEM Interchange Numbers: Nissan 48750-E7005, 48750-E7705, Subaru 783131010ᴳ * Airtex 1S6172 * BWD CS154 * CARQUEST Premium By WELLS 53-27620 * Duralast LS518 * NAPA Echlin KS6673 * General Motors 19021152 * Import Direct 18-0325 * Kem UL15-10 * Subaru 783131010
Beck/Arnley 2011174 Fits: Subaru (USA models listed) * 1982-1987 Brat * 1986-1987 GL * 1980-1984 DL * 1980 GLF * 1980 GL * 1980-1987 Standard Datsun * 1968-1973 510 * 1970-1978 240Z, 260Z, 280Z * 1979-1983 280ZX * 1972-1973 1200 (B110) * 1979-1982 210 (B310) * 1978-1981 510 (A10) * 1977-1981 810 (Bluebird) * 1982-1983 Maxima (910 Bluebird) * 1979-1982 310 (N10) * 1977-1983 200SX (S10)
ACDelco E1406 ignition switch also fits: * Same as Beck/Arnley 2011174 except B110, except Subaru * 1979 Datsun 620 * 1980-1982 Datsun 720 USA for steering lock
48750-E4700
48750-E4700ᴳ for STEERING LOCK 7804-
Small diameter five spade terminals One screw lug Lock position inline with screw lug Supercedes 48750-E4700/48750-E4701 * Datsun B120 Sunny Truck * Datsun 510 * Datsun #311 Roadster * Datsun 720 USA
SMP 116
SMP US 116 Sᴳ for Subaru 1978-1981. Does not fit Datsun 1200 (wiring differs), though looks very similar and uses the same key)
Wiring
See also: Ignition Coil Wiring
The 1971 switch has four spade terminals. The 1972 and newer adds the "Accessory" position and so has five spade terminals.
NOTE: The two wires at the front of the Lock Cylinder are for the Key Warning Buzzer system.
| ACC Position |
|---|
ACC on the Ignition Switch feeds only the Radio and the Rear Defroster.
Since 1971 didn't get ACC position, 1971 radios connect to Fuse Box 'L' wire (meaning radio can be operated with key OFF)
Switch internal connections
| Position | Internal Connection | |
| Off/Garage | no connections | |
| Lock | no connections, column locked | |
| Accessory | Battery to ACC | |
| Run | Battery to ACC + IG | |
| Start | Battery to IG + Resistor + Start* |
*Starting with 1974 automatic models and all newer, ACC is also hot while in the Start position. Wiring Table
| Switch Wire Color | Connection | |
| W | B (Battery) | |
| BW | IG (ignition/Run) | |
| BW (LW for B210) | ACC (Accessory, not present on 1971 switch) | |
| BY (YB for B210) | S (starter) | |
| BR | R (resistor) |
Ignition Switch Wiring
Where do the wires go on a stock B110?
Terminal
Connects to ...
IG (ignition/run)
- To Ballast Resistor (non-coil side)
- To IG circuit of fuse box
S (starter)
- To Solenoid on the starter. On automatic 1200s*, this goes through the Inhibitor Switch
B (battery/hot)
- From fusible link connected to Battery
R (resistor)
- To Ballast resistor (coil side)
ACC (accessory)
- To Radio (through inline fuse)
- To heated rear window glass (through inline fuse)
*Automatics became available in 1973 in North America.
Common Problems
Start Problems
Ever had the "sometime it doesn't operate the Starter until I turn the key back and forth a few times" problem?
This occurs because the relatively high current loads of the starter solenoid tend to burn the ignition switch Start contacts after some years. This only gets worse. You might think you could prevent this problem by using a relay. The S wire could go to to a relay, and the relay could go from the Main Fuse to the starter. The problem is if the relay sticks, you won't be able to turn it off with the key. To prevent this, you could use two relays, with the main power fed through a relay connected to the IG terminal of the switch. Then if the starter relay sticks, you could turn key to ACC or OFF to stop it.
It is easiest just to replace the switch.
Another common issue is when the key is turned to the 'start' position, and it does not spring back to the 'on' position when the key is released. The switch needs to be replaced in this situation also.
Starts but does not Run
"It will crank and catch fire when key turned to Start, but dies as soon as I release the key to the ON position"
The coil is getting Start current, but not Run current. Causes may include:
- Ballast Resistor is burned open. It is only used to Run, but not to Start
- Wiring is loose or bad on ballast resistor
- Ignition Switch is bad or incorrect part. START position works, but ON does not
Testing
You can test the ignition switch with an ohmmter, which is the most direct way. Alternatively, a test light will work, but needs a voltage feed.
- Pull the wiring connector off the back of the ignition switch
- Unscrew the ignition switch from bracket (early/STD 1200s) or rear of the key lock cylinder (Steering Lock 1200s)
- Check ohms between S and B terminals. Should be infinite ohms (no reading)
Turn switch with screwdriver to Start and hold it there. Ohms between S and B should be 0 ohms. If it does not test out correctly, get another ignition switch.
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