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The Flickering cause is the AC Magnetic Clutch relay, which is located in the Engine Bay Fuse Box. The flickering was effect to models between 2003-2006, Anyway I did not know the 2008 models were also affected. This could a remote case.Anyways Toyota issued a TSB to the same. The job is a 2 minute job. Also one needs to is replace the relay.

I am detail the inspection procedure.

1. Open the Engine Bay - Fuse Box.

2. Identify the AC Magnetic Relay( to locate use the map location on the inner cover of the fuse box)

3. Verify if this is the part number mentioned on the relay - If the part number is 90987--02022, please replace the relay with the countermeasured relay P/N 90987--02028.

4. The Vehicle should be without the Ignition Keys inserted.

5. If the new part number is what already installed in your vehicle, then only a diagnostic scan would tell you the problem.

The attached images are the Relay and the Relay location ( circled in red ) in the Fuse Box.

Last after replacement, disconnect the battery (-) termninal for 3 minutes and reconnect. And your are good to go.

Hope this helps.

Very good post, but the fuse box does not match mine. I am attach photos of mine. I cannot find a relay named "mag clch". One pic is of fuse box and small relay box behind. another is of the label on the underside of that small fuse box. The last is of the relay box on the left side of the engine bay with lid labels. Where is my "Magnetic clutch relay"?

Does anyone have a service manual who would look up the location of the magnetic clutch relay? My fuse box in engine compartment just has fuses, and there is a small relay box just behind. Those relays are labeled "starter- c/open-ig2-fan no.2 f/pmp- efi main- a/f". It seems that there is another relay box somewhere.

A/c System Suddenly quit blowing cold air. Car was driven through heavy rain night before. Green light blinks on A/C button. Checked codes and got back 21 & 24. Went and picked up a relay #90987-02028 from dealer. I could not find the relay location to even try it. It is also expensive. When the engine is at idle and the a/c is selected, there is a load on the engine so the clutch sounds like it is engaging. Is the relay located just beneath the brake fluid reservoir on the drivers side of the firewall? Any ideas with those two codes? Thanks for any help.

A/c System Suddenly quit blowing cold air. Car was driven through heavy rain night before. Green light blinks on A/C button. Checked codes and got back 21 & 24. Went and picked up a relay #90987-02028 from dealer. I could not find the relay location to even try it. It is also expensive. When the engine is at idle and the a/c is selected, there is a load on the engine so the clutch sounds like it is engaging. Is the relay located just beneath the brake fluid reservoir on the drivers side of the firewall? Any ideas with those two codes? Thanks for any help.