ABS and Brake warning comes on, voltage drops to (zero). Ding dong chime continues...No driving difference. Radio goes out. Codes thrown:
P1626 Theft deterrent fuel enable signal not received
U1041 Lost communications with electronic brake control module
U1064 Lost communications with BCM
U1016 Lost communications with ECM Engine control module
U1000 Missing data primary ID
C0455 Front steering position sensor
C0292 ECBM failed to receive data from PCM
U1056
U1062
I removed the splice pack 205 comb, scoped each Control Module. Most show data packs report with 7volt high, but the data pack signal falls to below 0, like maybe -1.0v then trails to 0v, before the next packet.
The car starts fine and runs okay. Attached osciloscope scans with BCM + additional pin connected as listed. Some of the scope photos show I believe only the Data from the BCM even tho an additonal pin is connected. I guess no addtional data is sent on that module so you only see the data from the BCM. Note the hig & low voltage. The low dips down below 0v???? Iam guessing the data pack should not go below 0V...any thoughts what I am missing? My scope is set for 2V/div, 5mS
P1626 Theft deterrent fuel enable signal not received
U1041 Lost communications with electronic brake control module
U1064 Lost communications with BCM
U1016 Lost communications with ECM Engine control module
U1000 Missing data primary ID
C0455 Front steering position sensor
C0292 ECBM failed to receive data from PCM
U1056
U1062
I removed the splice pack 205 comb, scoped each Control Module. Most show data packs report with 7volt high, but the data pack signal falls to below 0, like maybe -1.0v then trails to 0v, before the next packet.
The car starts fine and runs okay. Attached osciloscope scans with BCM + additional pin connected as listed. Some of the scope photos show I believe only the Data from the BCM even tho an additonal pin is connected. I guess no addtional data is sent on that module so you only see the data from the BCM. Note the hig & low voltage. The low dips down below 0v???? Iam guessing the data pack should not go below 0V...any thoughts what I am missing? My scope is set for 2V/div, 5mS
Attachments
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BCM connected + A pin Data to 2nd Splice pack.jpg34.4 KB · Views: 4
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BCM connected.jpg31.3 KB · Views: 4
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BCM connected +H pin SCM.jpg32.3 KB · Views: 2
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BCM connected + M pin.jpg31.6 KB · Views: 2
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BCM connected + M pin .jpg370.7 KB · Views: 2
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BCM connected + L pin MSM.jpg31.1 KB · Views: 2
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BCM connected + G pin IPC.jpg33.2 KB · Views: 3
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BCM connected + C pin ABS.jpg30.9 KB · Views: 3
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BCM connected + B pin PCM.jpg29.2 KB · Views: 3