Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
Keyless Receiver Unit Input Test
2003 Acura MDX TouringSECTION Keyless Receiver Unit Input Test
- Remove the glove box (see GLOVE BOX REMOVAL/INSTALLATION ).
- Disconnect the 7P connector (A) from the keyless receiver unit (B).
- Inspect the connector and socket terminals to be sure they are all making good contact.
- If the terminals are bent, loose or corroded, repair them as necessary, and recheck the system.
- If the terminals are OK, go to step 4.
- With the connector still disconnected, make these input tests at the connector.
- If any test indicates a problem, find and correct the cause, then recheck the system.
- If all the input tests prove OK, replace the keyless receiver unit.KEYLESS RECEIVER UNIT INPUT TEST
Cavity Wire Test condition Test: Desired result Possible cause if result is not obtained 2 PNK/BLK Under all conditions Check for continuity between the No. 2 terminal and driver's multiplex control unit B19 terminal:
There should be continuity.
There should be no continuity to ground.- An open in the wire
- Short to ground
3 GRN/BLU Under all conditions Check for continuity between the No. 3 terminal and driver's multiplex control unit B18 terminal:
There should be continuity.
There should be no continuity to ground.- An open in the wire
- Short to ground
6 LT BLU Under all conditions Check for continuity between the No. 6 terminal and driver's multiplex control unit B21 terminal:
There should be continuity.
There should be no continuity to ground.- An open in the wire
- Short to ground
1 BLK Under all conditions Check for continuity to ground:
There should be continuity.- Poor ground (G503)
- An open in the wire
5 YEL Ignition switch ON (II) Check for voltage to ground:
There should be battery voltage.- Blown No. 9 (10 A) fuse in the driver's under-dash fuse/relay box
- An open in the wire
7 WHT/YEL Under all conditions Check for voltage to ground:
There should be battery voltage.- Blown No. 13 (7.5 A) fuse in the passenger's under-dash fuse/relay box
- An open in the wire
RENDER: 1.0x
NO RELATED
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.