My daughter’s 2007 Suzuki SX4 FWD base model has a central lock problem come and go repeatedly for years. (Been posted about that on “Central Lock Malfunction” long time ago 2012?).
1 Keyless remote can’t unlock all the door (Only Driver front and hatch door).
2 And remote can not lock all the door. (Only hatch door response but need a push on hatch door to get it tightly closed.).------- Check and tune the striker for hatch latch, no improvement.
3 Using key on driver door almost the same as #1 & #2, but can also lock the driver front door.
4 While driving, the rear hatch door lock make a “humming sound” first, then will keep making “kicking “ noise all the way of driving (even when stop and idling)-----it was the hatch lock actuator making lock/unlock sound all the time. Pulling the hand brake (E-brake) will stop the sound. But releasing the hand brake will get the sound back.
(Had changed a used hatch door actuator with no change, same problems.)
Recent trial and tests:
Recently, since retired and have more time to study the manual and wiring diagram, try to fix that again.
Follow the manual steps by steps:
1 Check battery and all fuse--------all normal.
2 Check all door locks connectors pins for continuity ------ as manual stated. As well as the lock switches.
3 Applying power (+ - to each pins in turns ) ------ will function to lock and unlock accordingly.
4 Apply key to lock cylinder to lock and unlock ------match the continuity as the manual stated.
All the door locks & switches seem functioning properly.
Checking the BCM and wiring:
Get to a point that I found the BCM under the steering wheel ( I assume the #36770-80J60 is the BCM)----- saw a burnt out wire (The black with silver mark, the 1st one with “yellow circle”) that also brown the corresponding connecting pin of the BCM. (Please refer to the photos.)
Q1 ***Can anyone please tell me what this wire for(The burnt 1st black with silver mark wire----the one circulated with yellow circle.)? Is it the ground wire ( I think this may be the ground wire but not sure) ?
If this is for the ground, then what make it burnt out? Poor contact in the other end or other places? Where should I look into? Thanks.
Q2 If I was going to buy a new (used) BCM, what is the different between the model #36770-80J60 (the one in my SX4) (for 07/08 model?) VS #36770-80J61 (for 08 / 09 model?) module?
And what are the 36770-80J20 & 36770-80J21 & 36770-54L62 models for?
Are these modules the same BCM & interchangeable? Or some is not BCM or some is specifically for AWD and /or 4 doors sedan? Thanks.
I cleaned up the connecting pins of the BCM and use an add on new wire & plug to re-attach the black/ w silver mark wire back to the connector. Yet, the problem persists.
No DRL now:
The only good is: I lost the DRL function------No daytime running light on (Yet both low beam and high beam work, so not a bulb problem.) while driving now though the DRL icon is on at the panel (Not sure when it goes out, but sure have it before, and don’t know if that related to the wiring of the BCM this time), and the kicking sound at the rear hatch door persists. But, the good is after I switch on my headlight during driving, the kicking sound will vanish (Not happening in the past as the kicking sound will keep on sounding no matter day or night driving. And apply the hand brake while driving will also stop the kicking sound like before).
I checked behind the passenger front glove compartment, there is NO DRL controller/ module. (I think my SX4 did not have it.) I found the keyless entry receiver / antenna at the right bottom side of the glove compartment. Test it’s pins for ground / continuity according to the manual-----seems work OK.
I check the 2 + 3 relays at the engine hood (2 relays in front of the main fuse box (#1 & #2), and 3 relays (#3/#4/#5) in front of the battery.). Yet the continuity of the relays without power (ie: OFF ----- No continuity for the middle and side connecting pins #86/#87.) ; and if apply battery to #30+/#85- (ie: On ----- There is continuity for pins #86/#87. ) ----- Work as the manual refers.
Q3 *** What are these 2 relays for, and what the other 3 relays for? Thanks.
Now, I am stuck with the situation that must get the headlights on while driving the car (since no DRL on), don’t know how to read / understand the wiring diagram and where to tackle the problem to get the DRL back on. (My SX4 model does not have the DRL controller/module.)
Have been working for the whole weekend till tonight, still there is no progress.
Any suggestion is deeply appreciated.
Hope to get the car normal again for my daughter soon. Thanks a lot.