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.
Combination Switch Control Unit Input Test
2008 Acura RLSECTION Combination Switch 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.
- Remove the steering column covers (see STEERING COLUMN REMOVAL AND INSTALLATION ).
- Disconnect the 8P connector from the wiper/washer switch.
- 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 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, go to step 5.WIRE TEST CONDITION CHART
Cavity Wire Test condition Test: Desired result Possible cause if desired result is not obtained 4 LT GRN Under-dash fuse/relay box connector X (39P) disconnected Check for continuity between No. 4 terminal and the under-dash fuse/relay box connector X (39P) No. 27 terminal: There should be continuity. An open in the wire
- Reconnect the connectors and, make these input test at the connectors.
- If any test indicates a problem, find and correct the cause, then recheck the system.
- If all the input tests prove OK, the combination switch control unit must be faulty, replace the wiper/washer switch.WIRE TEST CONDITION CHART
Cavity Wire Test condition Test: Desired result Possible cause if desired result is not obtained 3 BLK Under all conditions Measure the voltage to ground: There should be less than 0.5 V. - Poor ground (G503, G601)
- An open in the wire
8 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
7 YEL Ignition switch ON (II) Measure the voltage to ground: There should be battery voltage. - Blown No. 21 (7.5 A) fuse in the under-dash fuse/relay box
- A short to ground in the wire
- 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.