Fuses and relays - Revision history

Cliff: /* Power distribution and fusible links */

2026-07-19T00:16:14Z

Power distribution and fusible links

← Older revision		Revision as of 00:16, 19 July 2026
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	The fuse block is only one part of the Fiero power distribution system.		The fuse block is only one part of the Fiero power distribution system.

	The ~~1988 service manual describes the~~ power distribution system ~~as including~~:		The Fiero power distribution system may include:

	* Fusible links		* Fusible links
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	* Light switch		* Light switch
	* Ignition switch		* Ignition switch
			* Related connectors and feed circuits

	Fusible links are short protective wire sections used on higher-current feed circuits. They are intended to melt and stop current flow if excessive current occurs in a part of the electrical system that is not protected by ordinary fuses or circuit breakers.		Fusible links are short protective wire sections used on higher-current feed circuits. They are intended to melt and stop current flow if excessive current occurs in a part of the electrical system that is not protected by ordinary fuses or circuit breakers.
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	Fusible links should not be replaced with ordinary wire.		Fusible links should not be replaced with ordinary wire.

	~~The 1988~~ service ~~manual lists~~ several ~~fusible~~-~~link locations~~, including ~~fusible links at~~ the battery junction block, forward lamp harness, starter solenoid, and rear bulkhead connector. Exact fusible-link ~~identification~~ should be checked against the correct model-year wiring diagram.		Factory service information identifies fusible links in several power-distribution areas, including locations such as the battery junction block, forward lamp harness, starter solenoid, and rear bulkhead connector. Exact fusible-link locations, colors, ratings, and protected circuits should be checked against the correct model-year wiring diagram.

	Related topics:		Related topics:

Cliff: /* See also */

2026-07-18T23:21:09Z

Cliff: /* Rear fuse-block connectors */

2026-07-18T23:20:57Z

Rear fuse-block connectors

← Older revision		Revision as of 23:20, 18 July 2026
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	== Rear fuse-block connectors ==		== Rear fuse-block connectors ==

	~~The~~ rear~~-view diagram shows~~ connector cavity locations at the back of the fuse block.		Some service information shows rear connector cavity locations at the back of the fuse block.

	~~The two brown~~ rear ~~connector locations are marked:~~		These rear connections can be relevant when diagnosing intermittent power loss, heat damage, loose terminals, or previous wiring repairs.

	* '''IGN'''		If rear fuse-block connector work is required, use the correct model-year wiring diagram and connector-location information. Do not rely only on the front fuse-block label.
	* '''LP'''

	~~These should be checked if there~~ is ~~evidence of heat damage~~, ~~loose connections, poor previous repairs, or intermittent power loss through~~ the fuse block.

	== Circuit breakers ==		== Circuit breakers ==

Cliff: /* Circuit breakers */

2026-07-18T23:20:25Z

Circuit breakers

← Older revision		Revision as of 23:20, 18 July 2026
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	The Fiero fuse block also uses circuit breakers.		The Fiero fuse block also uses circuit breakers.

	The most obvious ~~ones~~ shown in the diagram are:		The most obvious circuit breakers shown in the fuse-block diagram are:

	* '''WDO''' – 30A circuit breaker for the power-window circuit		* '''WDO''' – 30A circuit breaker for the power-window circuit
	* '''PWR ACC''' – 30A circuit breaker for power-accessory circuits		* '''PWR ACC''' – 30A circuit breaker for power-accessory circuits

	Unlike an ordinary fuse, a circuit breaker may reset ~~after cooling, depending on type~~. This can ~~cause~~ an intermittent ~~fault~~.		The owner's manual also notes that some circuits use circuit-breaker protection instead of an ordinary fuse. Examples include headlight wiring and the windshield wiper motor.

			Unlike an ordinary fuse, a circuit breaker may open during an overload and later reset. This can create an intermittent problem where a circuit stops working, then works again after the breaker cools.

			If a circuit breaker repeatedly opens, the cause of the overload should be found rather than bypassing the protection.

	== Flasher and relay locations ==		== Flasher and relay locations ==

Cliff at 23:20, 18 July 2026

2026-07-18T23:20:09Z

← Older revision		Revision as of 23:20, 18 July 2026
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	Because Fieros were offered with different engines, trim levels, and options, the exact downstream loads can vary by year and equipment. The fuse-block labels themselves are usually the most useful starting point for diagnosis.		Because Fieros were offered with different engines, trim levels, and options, the exact downstream loads can vary by year and equipment. The fuse-block labels themselves are usually the most useful starting point for diagnosis.

			== Power distribution and fusible links ==

			The fuse block is only one part of the Fiero power distribution system.

			The 1988 service manual describes the power distribution system as including:

			* Fusible links
			* Fuses
			* Circuit breakers
			* Light switch
			* Ignition switch

			Fusible links are short protective wire sections used on higher-current feed circuits. They are intended to melt and stop current flow if excessive current occurs in a part of the electrical system that is not protected by ordinary fuses or circuit breakers.

			Fusible links should not be replaced with ordinary wire.

			The 1988 service manual lists several fusible-link locations, including fusible links at the battery junction block, forward lamp harness, starter solenoid, and rear bulkhead connector. Exact fusible-link identification should be checked against the correct model-year wiring diagram.

			Related topics:

			* [[Electrical system]]
			* [[Wiring diagrams]]
			* [[Connector pinouts]]

	== Rear fuse-block connectors ==		== Rear fuse-block connectors ==
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	== Flasher and relay locations ==		== Flasher and relay locations ==

	The owner's manual identifies ~~several~~ under-dash locations ~~for related electrical components.~~		The fuse block protects many circuits, but several flashers and relays are located elsewhere.

			The owner's manual identifies these under-dash locations:

	* The hazard flasher and horn relay are located under the right side of the instrument panel.		* The hazard flasher and horn relay are located under the right side of the instrument panel.
	* The turn-signal flasher is located on the left side of the steering column, under the instrument panel.		* The turn-signal flasher is located on the left side of the steering column, under the instrument panel.

	~~These parts should not be confused with~~ the ~~fuse block itself.~~		The 1988 service manual gives additional component locations, including:

			* Fuse block — behind the left side of the instrument panel
			* Coolant fan relay — left front corner of the front compartment
			* Fuel pump relay — engine compartment, left side of the rear bulkhead
			* A/C power relay — front compartment, on the right side of the heater/A/C module
			* High-speed blower relay — on the right side of the heater/A/C plenum

	~~Other relays, such as the fuel pump relay~~, ~~radiator fan~~ relay~~, air-conditioning relay, and headlight control components, are located elsewhere depending on circuit~~ and model year.		These locations are useful starting points, but relay locations and wiring details should still be verified against the correct model-year wiring diagram.

	Related topics:		Related topics:
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	* [[Headlight control module]]		* [[Headlight control module]]
	* [[Horn]]		* [[Horn]]
			* [[Air conditioning]]

	== What the common abbreviations mean ==		== What the common abbreviations mean ==

Cliff: /* Fuse list */

2026-07-18T23:19:14Z

Fuse list

← Older revision		Revision as of 23:19, 18 July 2026
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	\| FAN E		\| FAN E
	\| 20A		\| 20A
	\| Coolant fan relay coil; engine/trunk blower where equipped		\| Coolant fan relay coil; engine/trunk blower on earlier V6 cars where equipped
	\| Cooling fan control circuit		\| Cooling fan control circuit; verify by model year
	\|-		\|-
	\| TURN B/U		\| TURN B/U

Cliff: /* Fuse list */

2026-07-18T22:57:21Z

Fuse list

← Older revision		Revision as of 22:57, 18 July 2026
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	\| FAN E		\| FAN E
	\| 20A		\| 20A
	\| Coolant fan relay coil; engine/trunk blower on equipped ~~V6 models~~		\| Coolant fan relay coil; engine/trunk blower where equipped
	\| ~~Radiator~~ fan control circuit~~; engine-compartment blower operation depends on year/equipment~~		\| Cooling fan control circuit
	\|-		\|-
	\| TURN B/U		\| TURN B/U

Cliff: /* Fuse list */

2026-07-18T22:56:46Z

Fuse list

← Older revision		Revision as of 22:56, 18 July 2026
Line 50:		Line 50:
	\| FAN E		\| FAN E
	\| 20A		\| 20A
	\| Coolant fan relay coil		\| Coolant fan relay coil; engine/trunk blower on equipped V6 models
	\| Radiator fan control circuit		\| Radiator fan control circuit; engine-compartment blower operation depends on year/equipment
	\|-		\|-
	\| TURN B/U		\| TURN B/U

Cliff: /* Fuse list */

2026-07-18T22:53:40Z

Fuse list

← Older revision		Revision as of 22:53, 18 July 2026
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	\| ECM IGN		\| ECM IGN
	\| 10A		\| 10A
	\| ECM / ~~engine-control~~ ignition feed		\| ECM / Computer Command Control ignition feed
	\| Engine control power		\| Engine-control ignition power
	\|-		\|-
	\| F PUMP		\| F PUMP
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	\| TAIL		\| TAIL
	\| 20A		\| 20A
	\| Tail lamps, parking lamps, side ~~markers~~, license ~~lamps~~		\| Tail lamps, parking lamps, side marker lamps, license plate lamp, and related illumination
	\| Exterior running lights		\| Exterior running lights and related illumination
	\|-		\|-
	\| FAN E		\| FAN E
	\| 20A		\| 20A
	\| Coolant fan relay~~, trunk blower~~		\| Coolant fan relay coil
	\| ~~Cooling system~~		\| Radiator fan control circuit
	\|-		\|-
	\| TURN B/U		\| TURN B/U
	\| 20A		\| 20A
	\| Turn-signal and backup~~-lamp circuit~~		\| Turn-signal flasher and backup lamps
	\| Signal / reverse-light related		\| Signal / reverse-light related
	\|-		\|-
	\| TBI INJ1		\| TBI INJ1
	\| 5A		\| 5A
	\| ~~TBI~~ injector circuit 1		\| Throttle-body injection injector circuit 1
	\| Four-cylinder engine-control related		\| Four-cylinder engine-control related
	\|-		\|-
	\| STOP HAZ		\| STOP HAZ
	\| 20A		\| 20A
	\| Stop lamps ~~and~~ hazard flasher		\| Stop lamps, hazard flasher, and warning chime
	\| Brake-light / hazard circuit		\| Brake-light / hazard circuit
	\|-		\|-
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	\| GAUGES		\| GAUGES
	\| 10A		\| 10A
	\| Gauges and related warning circuits		\| Gauges and related warning/control circuits
	\| Instrument-related		\| Instrument-related circuits
	\|-		\|-
	\| TBI INJ2		\| TBI INJ2
	\| 5A		\| 5A
	\| ~~TBI~~ injector circuit 2		\| Throttle-body injection injector circuit 2
	\| Four-cylinder engine-control related		\| Four-cylinder engine-control related
	\|-		\|-
	\| BAT		\| BAT
	\| 20A		\| 20A
	\| Battery-fed ~~accessory~~ circuit		\| Battery-fed circuit
	\| ~~Exact loads can vary by year / equipment~~		\| Constant-power feed for related circuits
	\|-		\|-
	\| WDO		\| WDO
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	\| INST LP		\| INST LP
	\| 5A		\| 5A
	\| Instrument panel ~~illumination~~ lamps		\| Instrument panel lamps and headlight warning
	\| Dash lighting		\| Dash lighting / warning circuit
	\|-		\|-
	\| RADIO		\| RADIO
	\| 10A		\| 10A
	\| Radio ~~circuit~~		\| Radio and related control circuits
	\| Radio ~~power~~		\| Radio, cruise control, VSS/TCC-related circuits depending on equipment
	\|-		\|-
	\| PWR ACC		\| PWR ACC
	\| 30A circuit breaker		\| 30A circuit breaker
	\| Power ~~accessories~~		\| Power door locks and rear window defogger
	~~\| Often associated with power~~ locks / rear defogger ~~circuits depending on equipment~~		\| Power accessory circuit
	\|-		\|-
	\| WIPER		\| WIPER
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	\| CTSY/LID		\| CTSY/LID
	\| 25A		\| 25A
	\| Courtesy ~~/ decklid-related circuit~~		\| Courtesy lights, rear compartment light, rear lock relay, and power sport mirror control
	\| Interior courtesy / rear compartment related		\| Interior courtesy / rear compartment / power mirror-related circuit
	\|}		\|}

	Because Fieros were offered with different engines, trim levels, and options, the exact downstream loads can vary ~~somewhat~~ by year and equipment. The fuse-block labels themselves~~, however,~~ are the most useful starting point for diagnosis.		Because Fieros were offered with different engines, trim levels, and options, the exact downstream loads can vary by year and equipment. The fuse-block labels themselves are usually the most useful starting point for diagnosis.

	== Rear fuse-block connectors ==		== Rear fuse-block connectors ==

Cliff: /* Fuse block layout */

2026-07-18T22:51:02Z

Fuse block layout

← Older revision		Revision as of 22:51, 18 July 2026
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	Because fuse labels are abbreviated, the fuse list below expands the labels into their common circuit meanings.		Because fuse labels are abbreviated, the fuse list below expands the labels into their common circuit meanings.

			<div style="clear: right;"></div>

	== Fuse list ==		== Fuse list ==

← Older revision		Revision as of 23:21, 18 July 2026
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	* [[Hazard flasher]]		* [[Hazard flasher]]
	* [[Turn signal flasher]]		* [[Turn signal flasher]]
			* [[Power distribution]]
			* [[Fusible links]]

	[[Category:Fieropedia]]		[[Category:Fieropedia]]