Quote:
Originally Posted by gbalthrop
Here is the TIS schematic for M30 Blower Motor, bottom Left of schematic:
https://www.newtis.info/tisv2/a/en/e...bution/ufClUrJ
As you are probably aware, there was a recall announced in late 2017 for Blower Motor Harness Replacement. RCRIT describing procedure to be followed is attached. First thing I would do is check online to see if your vehicle has had that recall performed:
https://www.nhtsa.gov/recalls
Then test at Blower Motor Connector, X18722 for each of the following:
1) Continuity to Ground at Pin #1, Brown wire, of Connector X18722;
2) 12V+ at the Red/Violet wire at Pin #2 of Connector X18722 (fuse F88);
3) If BOTH 12V+ & ground are OK, if you have a meter that can test Duty Cycle of the White/Brown PWM (Pulse Width Modulated) control wire from the DME, test that at High Speed Manual A/C Control Panel setting vs. Low Speed Blower Speed setting, OR simply measure Voltage of that wire in reference to Chassis Ground, and see if voltage changes with speed setting. Here is the TIS "Connector View" for that X18722 Connector:
https://www.newtis.info/tisv2/a/en/e...i-lim/CT7WvuoC
The Recall was supposed to change the ENTIRE 12V+ Supply wire and also Ground wire, NOT just the Connector. The issue was overheating at the connector, with MELTING of the connector/insulation. Prior to the recall, a prior owner or shop may have simply replaced the connector. OR, the recall may have been performed with something NOT properly done related to NEW connections at the Connector at the firewall side of the JB (Junction Box).
Please let us know what you find,
George |
No, the entire wire rarely gets replaced. The entire wire only gets replaced if the insulation has been burned off. If the wiring looks normal, or is only discoloured, only the connector gets replaced.