4-Terminal Normally Open Relay (No Relay); Headlight Relay And Cooling Fan Relay; Horn Relay And Tns Relay - Mazda MX-5 1990 Workshop Manual

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05UOTX-275
9MUOTX-027
05UOTX-276
05UOTX-277
RELAY
T
4-TERMINAL NORMALLY OPEN RELAY (NO RELAY)
Inspection
The relays listed below are 4-terminal normally open (NO)
relays.
• Horn relay
• TNS relay
• Headlight relay • Cooling fan relay
05UOTX-029
Headlight relay and cooling fan relay
1. Check continuity between terminals 3 and 4.
Terminal Continuity
3-4 No
2. If not as specified, replace the relay.
3. If correct, go to Step 4.
4. Apply 12V to terminal 1 and ground terminal 2. Check for
continuity between terminals 3 and 4.
Terminal Continuity
3-4
Yes
5. If not as specified, replace the relay.
Horn relay and TNS relay
1. Check continuity between terminals 1 and 3.
Terminal Continuity
1-3
No
2. If not as specified, replace the relay.
3. If correct, go to Step 4.
4. Apply 12V to terminal 2 and ground terminal 4. Check for
continuity between terminals 1 and 3_
Terminal
Continuity
1-3
Yes
5. If not as specified, replace the relay.
T-19