1998 nissan altima bcm location - 1998 Nissan Altima

This video will show you haw to replace the bcm.

https://www.youtube.com/watch?v=TTCe7Rup3ow

Along the right side of the steering column near the diagnostic link connector.

Low Beam Operation With the lighting switch in 2ND position, the BCM receives input requesting the headlamps to illuminate. This input is communicated to the IPDM E/R across the CAN communication lines. The CPU of the IPDM E/R controls the headlamp low relay coil. When energized, this relay directs power ? through 15A fuse (No. 36, located in the IPDM E/R) ? through IPDM E/R terminal 20 ? to headlamp RH terminal 1, and ? through 15A fuse (No. 45, located in the IPDM E/R) ? through IPDM E/R terminal 30 ? to headlamp LH terminal 1. Ground is supplied ? to headlamp RH terminal 2 ? to headlamp LH terminal 2 ? through grounds E15 and E24. With power and ground supplied, low beam headlamps illuminate.

IPDM E/R - fuse box E/R -- engine room , under hood fuse box .

System Description EKS008LH Control of the headlamp system operation is dependent upon the position of the combination switch (lighting switch). When the lighting switch is placed in the 2ND position, the BCM (body control module) receives input requesting the headlamps (and tail lamps) to illuminate. This input is communicated to the IPDM E/R (intelligent power distribution module engine room) across the CAN communication lines. The CPU (central processing unit) of the IPDM E/R controls the headlamp high and headlamp low relay coils. When energized, these relays direct power to the respective headlamps, which then illuminate. OUTLINE Power is supplied at all times ? to headlamp high relay, located in the IPDM E/R, and ? to headlamp low relay, located in the IPDM E/R, and ? through 50A fusible link (letter f , located in the fuse and fusible link box) ? to BCM terminal 70. With the ignition switch in the ON or START position, power is supplied ? through 10A fuse [No. 1, located in the fuse block (J/B)] ? to BCM terminal 38. With the ignition switch in the ACC or ON position, power is supplied ? through 10A fuse [No. 6, located in the fuse block (J/B)] ? to BCM terminal 11. Ground is supplied

https://carmanuals2.com/brand/nissan/altima-2006-4924

Google is your best friend here, other years may be very similar to yours.

https://www.google.com/search?q=2005+nissan+altima+wiring+harness+diagram&biw=1280&bih=873&source=lnms&tbm=isch&sa=X&ved=0ahUKEwiVmr-hosDKAhUFcD4KHZupAUkQ_AUIBygC#tbm=isch&q=2005+nissan+altima+computer+wiring+harness+diagram

Sorry to tell you this, but neither of those computers would require any work on the HVAC case. The BCM is located above the instrument cluster. The TCM is located under the hood [which is a very poor location] I'm a 35 year professional mechanic. Sorry to tell you this, but my opinion of the Altima is very poor. These things have all sorts of problems, are hard to work on and the parts are very expensive. Lots of recalls and TSBs [technical service bulletins] TSB is dealer speak for "oops, we goofed". You can't blame the dealer for this one.

Relays are located in many places on vehicles. You would have to know what relay in particular you were looking for to find it's exact location. Fuses are easy to find, they are in the compartment right in front of your left knee on the lower section of the front of the dash, the drivers side of the dash between the door and the dash or sometimes under the hood. There is a door that pulls off to reveal the fuses, the door will have a diagram of the fuse locations. Here is a link from the internet with more information. Interior Fuse Box Location 1998 2001 Nissan Altima 1998 Nissan Altima...

You replace them from inside the trunk. Pull away the molding located behind the taillight. I believe it is a twist and turn type.

From the service manual, which is available relatively inexpensive at Promanuals.net here


Both front wiper relays are located in the IPDM E/R (intelligent power distribution module engine room)

Wiper switch (combination switch) is composed of a combination of 5 output terminals and 5 input terminals.
Terminal combination status is read by BCM (body control module)

BCM controls front wiper LO, HI, and INT (intermittent) operation

IPDM E/R operates the wiper motor according to CAN communication signals from the BCM.
Power is supplied at all times

through 50A fusible link (letter f , located in the fuse and fusible link box)

to BCM terminal 70, and

through 20A fuse (No. 39, located in the IPDM E/R)

to front wiper relay, located in the IPDM E/R
With the ignition switch in ON or START position, power is supplied at all times

through 10A fuse [No. 1, located in the fuse block (J/B)]

it should....same body style....