B002A: Right Curtain Deployment Control 2 (Subfault)

Before treating this as a wiring problem, confirm the vehicle has the wiring in question.

A second right curtain deployment circuit exists only on designs that fire the curtain through more than one channel. Plenty of vehicles do not. Long-wheelbase estates, minivans and three-row utilities commonly carry a curtain long enough that it is split into separately fired zones, and some vehicles stage a single curtain in two steps rather than two places. Many others fire the whole thing on one loop and have no second circuit at all. If B002A is stored on a vehicle whose service data shows a single-loop right curtain, you are not looking at a broken wire — you are looking at a restraints module carrying the wrong calibration, which happens after a module is replaced or reprogrammed with software intended for a different trim or market. That check takes minutes and prevents a long search for hardware nobody fitted.

Once the architecture is confirmed, the second circuit's identity tells you where to look, and it is a different part of the vehicle from the primary loop. Where the first channel serves the forward section over the front-seat head zone and terminates at the A-pillar, a second channel commonly serves the rear section over the second and third-row seating positions, with its connector and run further back along the roof rail — at the C-pillar, the D-pillar, or in the cargo-area trim. Confirm the specific layout against the service data, because it varies, but the direction of travel is consistent: this is a rear-of-vehicle inspection, not a windscreen-area one.

That relocation brings a different set of causes with it. Rear pillar and cargo trim comes off for third-row seat work, for luggage cover and cargo net fitment, for rear speaker installation and for tailgate or hatch strut replacement — all common jobs that never go near the A-pillar. And the rear of a roof rail collects water the front does not: a perished rear screen seal, a blocked sunroof drain terminating at the back of the headliner, or a roof rack foot mounted through the rail all let moisture reach the loop connector at the one end of the vehicle where it can pool.

One measurement caution specific to this code. On a staged design the two loops are not necessarily specified alike, because they can drive inflators of different size or configuration. Comparing loop 2's resistance against loop 1's reading and concluding the higher one is faulty is a real way to condemn a good airbag. Compare each against its own published figure.

The code-pairing rule is worth applying too. B002A and B0029 stored together are unlikely to be two independent failures in one curtain. What the two loops share is the module connector, the ground and, on many layouts, a common route through the pillar — so a both-loops fault should send you to what they have in common rather than to either circuit alone.

As with any deployment loop, this circuit ends in a pyrotechnic device. Follow the manufacturer's power-down and wait procedure, use only equipment approved for airbag measurement, and leave it to a qualified technician if either is unavailable.