What is the function and testing procedure for relays on Acura MDX?

These cars have a number of electrical add-ons, such as fuel injection system, horns, starter and fog lamps, which are controlled by relays that ensure transmission of electric signals to the respective components. By allowing low-current control circuit to open and close high-current power circuit relays function. These relays can be found in the engine compartment fuse/relay box and near the fuse and relay boxes under the dashboard. There are usually three main types: normally-open type-A , normally-open type-B, and five-terminal type ones. The internal circuitry is similar on Type A and Type B relays while they differ in external spade terminal arrangement and numbering. Compared to Type A or Type B relays, five-terminal relays have different internal circuitry plus an added external spade terminal. To test a relay it must be removed from the vehicle and an ohmmeter used to check for continuity. Normally open Type A relays for instance which are used for various purposes such as air conditioning; horns; window lifters have four external spade terminals arranged in two rows. When you unplug them from power sources you should make sure there is no connection between terminals No1 &No2 on one hand but also that there is between terminal No 3 connected to power source via (terminal No 4) a ground wire respectively.The normally-open Type B ones similarly have four external parallel rows of spade terminals just like their counterparts above mentioned for example blower motors; rear defoggers . For these B-type testing is simple which requires breaking connection between contact points No1&No3 when current ceases to flow through them whereas creating path between contacts No1&No3 using their corresponding feeds wires from connectors No2&No4 which are connected with interfaced power line as well as grounded with earth respectively.A last category we will take care about here is five-terminal devices known for moonroof control ; high beam cut-off and others need us to examine continuity between point No 1 &No 4 without power supply whereas later on it should be established by joining terminal No. 3 to power and the ground respectively provided that connection has been completed at points No2&No5. These relay switches are normally discarded as they cannot be repaired.

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24 Relays found

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Acura MDX Power Relay Assembly (Micro Iso) (Mitsuba)
Part Number: 39794-SDA-A05
$23.10 MSRP: $32.22
You Save: $9.12 (29%)
Ships in 1-3 Business Days
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Product Specifications
- Other Name: Relay Assembly, Power (Micro Iso) (Mitsuba) ; Horn Relay; Horn Relay, Relay
- Replaces: 39794-SDA-A04, 39794-SDA-A01
- Warranty: This genuine part is guaranteed by Acura's factory warranty.
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Acura MDX Engine Control Module Relay Assembly (Denso)
Part Number: 39794-SDA-902
$56.51 MSRP: $80.70
You Save: $24.19 (30%)
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Product Specifications
- Other Name: Relay Assembly, Engine Control Module (Denso); ECM Relay, Relay
- Replaces: 39794-SDA-901
- Warranty: This genuine part is guaranteed by Acura's factory warranty.
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Acura MDX Power Relay Assembly (Micro Iso) (Denso)
Part Number: 39794-SDA-A02
$27.21 MSRP: $37.95
You Save: $10.74 (29%)
Ships in 1-2 Business Days
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Product Specifications
- Other Name: Relay Assembly, Power (Micro Iso) (Denso)
- Warranty: This genuine part is guaranteed by Acura's factory warranty.
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Acura MDX Power Relay Assembly (Micro Iso) (Omron)
Part Number: 39794-SDA-A03
$23.10 MSRP: $32.22
You Save: $9.12 (29%)
Ships in 1-3 Business Days
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Product Specifications
- Other Name: Relay Assembly, Power (Micro Iso) (Omron); Power Relay, Relay
- Warranty: This genuine part is guaranteed by Acura's factory warranty.
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Acura MDX Fuel Pump Relay Assembly (Denso)
Part Number: 39794-SDA-004
$49.66 MSRP: $69.27
You Save: $19.61 (29%)
Ships in 1-3 Business Days
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Product Specifications
- Other Name: Relay Assembly, Fuel Pump (Denso); Fuel Pump Relay, Relay
- Replaces: 39794-SDA-003, 39794-SDA-305
- Warranty: This genuine part is guaranteed by Acura's factory warranty.
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Acura MDX Powertrain Control Module Relay Assembly (4P) (Mitsuba)
Part Number: 39794-S5A-901
$39.38 MSRP: $54.92
You Save: $15.54 (29%)
Ships in 1-2 Business Days
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Product Specifications
- Other Name: Relay Assembly, Engine Control Module (4P) (Mitsuba)
- Replaces: 39794-S5A-902
- Warranty: This genuine part is guaranteed by Acura's factory warranty.
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Acura MDX Relay Assembly, Power (4P) (Rc-2223) (Mitsuba)
Part Number: 39797-SM4-003
$65.04 MSRP: $92.88
You Save: $27.84 (30%)
Ships in 1-3 Business Days
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Product Specifications
- Warranty: This genuine part is guaranteed by Acura's factory warranty.
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Acura MDX Relay Assembly, Turn Signal And Hazard (Trico)
Part Number: 38300-S9V-A01
$72.84 MSRP: $102.18
You Save: $29.34 (29%)
Ships in 1-3 Business Days
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Product Specifications
- Other Name: Turn Signal & Hazard Flasher
- Replaced by: 38300-S9A-003
- Warranty: This genuine part is guaranteed by Acura's factory warranty.
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Acura MDX Turn Signal And Hazard Relay Assembly (Omron)
Part Number: 38300-SDB-A03
$27.13 MSRP: $37.83
You Save: $10.70 (29%)
Ships in 1-3 Business Days
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Product Specifications
- Other Name: Relay Assembly, Turn Signal And Hazard (Omron) ; Flasher; Flasher, Relay
- Replaces: 38300-SDA-A03
- Warranty: This genuine part is guaranteed by Acura's factory warranty.
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Acura MDX Main Relay Assembly (Mitsuba)
Part Number: 39400-S84-003
$87.78 MSRP: $123.15
You Save: $35.37 (29%)
Ships in 1-3 Business Days
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Product Specifications
- Other Name: Relay Assembly, Main (Mitsuba); ECM Relay, Relay Assembly
- Replaces: 39400-S82-A01, 39400-S84-A01
- Warranty: This genuine part is guaranteed by Acura's factory warranty.
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Acura MDX Relay Assembly (Micro Iso)
Part Number: 39792-SDA-A01
$8.90 MSRP: $12.42
You Save: $3.52 (29%)
Ships in 1-3 Business Days
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Product Specifications
- Other Name: Relay
- Warranty: This genuine part is guaranteed by Acura's factory warranty.
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Acura MDX Power Relay Assembly (5P) (Micro Iso) (Mitsuba)
Part Number: 39794-S10-003
$42.11 MSRP: $58.73
You Save: $16.62 (29%)
Ships in 1-3 Business Days
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Product Specifications
- Other Name: Relay Assembly, Power (5P) (Micro Iso) (Mitsuba); Relay
- Warranty: This genuine part is guaranteed by Acura's factory warranty.
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Acura MDX Cooling Fan Motor Relay (Micro Iso) (Omron)
Part Number: 39792-SJC-A01
$7.71 MSRP: $10.75
You Save: $3.04 (29%)
Ships in 1-3 Business Days
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Product Specifications
- Other Name: Relay Assembly, Power (Micro Iso) (Omron); Relay
- Warranty: This genuine part is guaranteed by Acura's factory warranty.
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Acura MDX Turn Signal And Hazard Relay Assembly (Mitsuba)
Part Number: 38300-SHJ-A04
$75.24 MSRP: $105.55
You Save: $30.31 (29%)
Ships in 1 Business Day
ADD TO CART
Product Specifications
- Other Name: Relay Assembly, Turn Signal And Hazard (Mitsuba) ; Turn Signal & Hazard Flasher; Flasher, Turn Signal & Hazard Flasher
- Warranty: This genuine part is guaranteed by Acura's factory warranty.
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Acura MDX Fuel Pump Relay (5P) (Mitsuba)
Part Number: 39794-S5A-003
$38.59 MSRP: $53.82
You Save: $15.23 (29%)
Ships in 1-3 Business Days
ADD TO CART
Product Specifications
- Other Name: Relay Assembly, Fuel Pump (5P) (Mitsuba)
- Replaces: 39794-S5A-004
- Warranty: This genuine part is guaranteed by Acura's factory warranty.
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Acura MDX Relay Assembly, Power
Part Number: 39794-T5A-J01
$32.99 MSRP: $47.12
You Save: $14.13 (30%)
Ships in 1-3 Business Days
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Product Specifications
- Other Name: Relay
- Warranty: This genuine part is guaranteed by Acura's factory warranty.
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Acura MDX Relay Assembly, Power (4P) (056700-7410) (Denso)
Part Number: 39792-SE0-003
$59.26 MSRP: $82.65
You Save: $23.39 (29%)
Ships in 1-3 Business Days
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Product Specifications
- Replaces: 39792-SP0-004, 39792-SE0-004, 39792-SM1-A01
- Warranty: This genuine part is guaranteed by Acura's factory warranty.
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Acura MDX Relay Assembly, Power (4P No 305) (056700-9260) (Denso)
Part Number: 39792-SL4-003
$59.26 MSRP: $82.65
You Save: $23.39 (29%)
Ships in 1-3 Business Days
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Product Specifications
- Other Name: Power Relay
- Replaces: 39792-SE4-A01
- Warranty: This genuine part is guaranteed by Acura's factory warranty.
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Acura MDX Relay Assembly, Power (Micro Iso)
Part Number: 39794-TBA-A01
$4.04 MSRP: $5.63
You Save: $1.59 (29%)
Ships in 1-3 Business Days
ADD TO CART
Product Specifications
- Other Name: Relay
- Warranty: This genuine part is guaranteed by Acura's factory warranty.
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Acura MDX Relay Assembly
Part Number: 39794-T7A-901
$4.64 MSRP: $6.47
You Save: $1.83 (29%)
Ships in 1-3 Business Days
ADD TO CART
Product Specifications
- Other Name: Relay
- Warranty: This genuine part is guaranteed by Acura's factory warranty.

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Acura MDX Relay

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Acura MDX Relay Parts Questions & Experts Answers

Relay Assembly, Power (4P No 305) (056700-9260) (Denso)
39792-SL4-003
Q: What is the function and testing procedure for relays on Acura MDX?
A: These cars have a number of electrical add-ons, such as fuel injection system, Horns, starter and fog lamps, which are controlled by relays that ensure transmission of electric signals to the respective components. By allowing low-current control circuit to open and close high-current power circuit relays function. These relays can be found in the engine compartment fuse/relay box and near the fuse and relay boxes under the dashboard. There are usually three main types: normally-open type-A , normally-open type-B, and five-terminal type ones. The internal circuitry is similar on Type A and Type B relays while they differ in external spade terminal arrangement and numbering. Compared to Type A or Type B relays, five-terminal relays have different internal circuitry plus an added external spade terminal. To test a relay it must be removed from the vehicle and an ohmmeter used to check for continuity. Normally open Type A relays for instance which are used for various purposes such as air conditioning; horns; window lifters have four external spade terminals arranged in two rows. When you unplug them from power sources you should make sure there is no connection between terminals No1 &No2 on one hand but also that there is between terminal No 3 connected to power source via (terminal No 4) a ground wire respectively.The normally-open Type B ones similarly have four external parallel rows of spade terminals just like their counterparts above mentioned for example blower motors; rear defoggers . For these B-type testing is simple which requires breaking connection between contact points No1&No3 when current ceases to flow through them whereas creating path between contacts No1&No3 using their corresponding feeds wires from connectors No2&No4 which are connected with interfaced power line as well as grounded with earth respectively.A last category we will take care about here is five-terminal devices known for moonroof control ; high beam cut-off and others need us to examine continuity between point No 1 &No 4 without power supply whereas later on it should be established by joining terminal No. 3 to power and the ground respectively provided that connection has been completed at points No2&No5. These relay switches are normally discarded as they cannot be repaired.