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.
Power Mirror Control Unit Input Test
2008 Acura RLSECTION Power Mirror Control Unit Input Test
WARNING: This page is about a different car, the 2008 Acura TL and 2007 Acura TL. However, it is still accessible from the selected car via links, so may be relevant.
NOTE:
Before troubleshooting the DPMS, troubleshoot the multiplex integrated control system first using B-CAN System Diagnosis Test Mode A (see
TROUBLESHOOTING - B-CAN SYSTEM DIAGNOSIS TEST MODE A
).
- Turn the ignition switch OFF.
- Remove the driver's dashboard lower cover (see DRIVER'S DASHBOARD LOWER COVER REMOVAL/INSTALLATION ).
- Disconnect the 26P connector (A) from the power mirror control 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 look OK, go to step 5.
- 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, the control unit must be faulty; replace it.WIRE TEST CONDITION REFERENCE
Cavity Wire Test condition Test: Desired result Possible cause if desired result is not obtained 25 BLK Under all conditions Check for continuity to ground:
There should be continuity.- Poor ground (G501)
- An open in the wire
12 YEL/GRN Ignition switch ON (II) Measure the voltage to ground:
There should be battery voltage.- Blown No. 20 (15 A) fuse in the under-dash fuse/relay box
- A short to ground in the wire
- An open in the wire
13 WHT/RED Under all conditions Measure the voltage to ground:
There should be battery voltage.- Blown No. 7 (7.5 A) fuse in the under-dash fuse/relay box
- A short to ground in the wire
- An open in the wire
26 GRY/BLU Under all conditions Measure the voltage to ground:
There should be battery voltage.- Blown No. 6 (7.5 A) fuse in the under-dash fuse/relay box
- A short to ground in the wire
- An open in the wire
23 PUR Power seat control unit connector C(12P) disconnected Check for continuity between the No. 23 terminal and power seat control unit connector C (12P) No. 4 terminal: There should be continuity. An open in the wire Check for continuity between the No. 23 terminal and body ground: There should be no continuity. A short to ground 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.